Possible fix for issue #36 for mount issue of POD with managed plugin

[wdurairaj]

• This is a possible fix for the issue Bug: Mount of the POD using managed docker volume plugin fails #36 , where the mount folder path for the managed plugin is handled
• I did see some unit tests failed which i will address on next commit

[docker@cld13b4 dory]$ make test
» test
»» Package unit tests
for pkg in github.com/hpe-storage/dory/common/chain github.com/hpe-storage/dory/common/connectivity github.com/hpe-storage/dory/common/docker/dockerlt github.com/hpe-storage/dory/common/docker/dockervol github.com/hpe-storage/dory/common/jconfig github.com/hpe-storage/dory/common/k8s/flexvol github.com/hpe-storage/dory/common/k8s/provisioner github.com/hpe-storage/dory/common/linux github.com/hpe-storage/dory/common/util; do echo "»»» Testing $pkg:" && export GOPATH=/home/docker/my_dory_fork PATH=$PATH:/home/docker/my_dory_fork/bin GOOS=linux GOARCH=amd64 && go test -cover $pkg; done
»»» Testing github.com/hpe-storage/dory/common/chain:
ok      github.com/hpe-storage/dory/common/chain        0.008s  coverage: 100.0% of statements
»»» Testing github.com/hpe-storage/dory/common/connectivity:
ok      github.com/hpe-storage/dory/common/connectivity 14.024s coverage: 78.0% of statements
»»» Testing github.com/hpe-storage/dory/common/docker/dockerlt:
?       github.com/hpe-storage/dory/common/docker/dockerlt      [no test files]
»»» Testing github.com/hpe-storage/dory/common/docker/dockervol:
?       github.com/hpe-storage/dory/common/docker/dockervol     [no test files]
»»» Testing github.com/hpe-storage/dory/common/jconfig:
ok      github.com/hpe-storage/dory/common/jconfig      0.005s  coverage: 100.0% of statements
»»» Testing github.com/hpe-storage/dory/common/k8s/flexvol:
ok      github.com/hpe-storage/dory/common/k8s/flexvol  0.009s  coverage: 9.9% of statements
»»» Testing github.com/hpe-storage/dory/common/k8s/provisioner:
ok      github.com/hpe-storage/dory/common/k8s/provisioner      0.201s  coverage: 11.0% of statements
»»» Testing github.com/hpe-storage/dory/common/linux:
--- FAIL: TestGetDeviceFromMountPoint (0.00s)
        bmount_test.go:37: For dev expected /dev/sda1 got /dev/sda2
--- FAIL: TestGetMountPointFromDevice (0.00s)
        bmount_test.go:53: For mountpoint expected /boot got /boot/efi
FAIL
coverage: 33.3% of statements
FAIL    github.com/hpe-storage/dory/common/linux        0.013s
»»» Testing github.com/hpe-storage/dory/common/util:
ok      github.com/hpe-storage/dory/common/util 0.035s  coverage: 21.1% of statements
»» Command unit tests
for cmd in github.com/hpe-storage/dory/cmd/dory github.com/hpe-storage/dory/cmd/doryd; do echo "»»» Testing $cmd:" && export GOPATH=/home/docker/my_dory_fork PATH=$PATH:/home/docker/my_dory_fork/bin GOOS=linux GOARCH=amd64 && go test -cover $cmd; done
»»» Testing github.com/hpe-storage/dory/cmd/dory:
ok      github.com/hpe-storage/dory/cmd/dory    0.009s  coverage: 72.9% of statements
»»» Testing github.com/hpe-storage/dory/cmd/doryd:
?       github.com/hpe-storage/dory/cmd/doryd   [no test files]

[wdurairaj]

Logs statements for mount with this change

Debug: 2018/05/23 11:08:13 cmd.go:49: out :mount: special device /opt/hpe/data/hpedocker-dm-uuid-mpath-360002ac0000000000101300100019d52 does not exist
Debug: 2018/05/23 11:08:13 cmd.go:49: out :
Error: 2018/05/23 11:08:13 bmount.go:52: BindMount failed with 32.  It was called with /opt/hpe/data/hpedocker-dm-uuid-mpath-360002ac0000000000101300100019d52 /var/lib/kubelet/pods/d69bda52-5e99-11e8-8d20-ecb1d7a4af30/volumes/hpe.com~hpe/sc-comp31-ac6b9a2a-5e98-11e8-8d20-ecb1d7a4af30 false.  Output=mount: special device /opt/hpe/data/hpedocker-dm-uuid-mpath-360002ac0000000000101300100019d52 does not exist
.
Debug: 2018/05/23 11:08:13 client.go:126: request: action=GET path=http://unix/plugins payload=
Debug: 2018/05/23 11:08:13 client.go:168: response: 200 OK, length=-1
Debug: 2018/05/23 11:08:13 dockerlt.go:62: returning []dockerlt.Plugin{dockerlt.Plugin{ID:"4b206a8e2338214099430b28400acf2c4d70bd8bfa6d06c5f08c0e73ba9a8140", Name:"hpe:latest", Enabled:true, Config:dockerlt.PluginConfig{Interface:dockerlt.PluginInterface{Socket:"hpe.sock"}}}, dockerlt.Plugin{ID:"9e0b886742a37518d04f979ec4464bbb6ec4495fe21503bd612afceae61a812d", Name:"docker/telemetry:1.0.0.linux-x86_64-stable", Enabled:true, Config:dockerlt.PluginConfig{Interface:dockerlt.PluginInterface{Socket:"metrics.sock"}}}}
Debug: 2018/05/23 11:08:13 cmd.go:33: ExecCommandOutput called with mount[--bind /var/lib/docker/plugins/4b206a8e2338214099430b28400acf2c4d70bd8bfa6d06c5f08c0e73ba9a8140/rootfs/opt/hpe/data/hpedocker-dm-uuid-mpath-360002ac0000000000101300100019d52 /var/lib/kubelet/pods/d69bda52-5e99-11e8-8d20-ecb1d7a4af30/volumes/hpe.com~hpe/sc-comp31-ac6b9a2a-5e98-11e8-8d20-ecb1d7a4af30]
Debug: 2018/05/23 11:08:13 cmd.go:49: out :
Debug: 2018/05/23 11:08:13 cmd.go:33: ExecCommandOutput called with selinuxenabled[]
Debug: 2018/05/23 11:08:13 cmd.go:49: out :
Debug: 2018/05/23 11:08:13 selinux.go:32: selinuxenabled returned 0 and err=<nil>
Debug: 2018/05/23 11:08:13 selinux.go:43: Chcon about to change context of /opt/hpe/data/hpedocker-dm-uuid-mpath-360002ac0000000000101300100019d52 to svirt_sandbox_file_t
Debug: 2018/05/23 11:08:13 cmd.go:33: ExecCommandOutput called with chcon[-t svirt_sandbox_file_t /opt/hpe/data/hpedocker-dm-uuid-mpath-360002ac0000000000101300100019d52]
Debug: 2018/05/23 11:08:13 cmd.go:49: out :chcon: cannot access ‘/opt/hpe/data/hpedocker-dm-uuid-mpath-360002ac0000000000101300100019d52’: No such file or directory

[wdurairaj]

chcon command still fails due to improper path which i will correct.

[wdurairaj]

closing this pull request , and opened a new one -- #42