Fix linter errors in client & utils package

[praveingk]

Steps to reproduce:

1. Replace .golangci.yml to this version
2. Run golangci-lint run --config=./.golangci.yaml ./pkg/ibm_plugin/...

pkg/client/client.go:37: line is 145 characters (lll)
pkg/client/client.go:59:21: ST1005: error strings should not be capitalized (stylecheck)
pkg/client/client.go:66:1: paramTypeCombine: func(url string, method string, body io.Reader) ([]byte, error) could be replaced with func(url, method string, body io.Reader) ([]byte, error) (gocritic)
pkg/client/client.go:81:24: response body must be closed (bodyclose)
pkg/client/client.go:92:1: paramTypeCombine: func(namespace string, cloud string, resourceName string) ([]*paragliderpb.PermitListRule, error) could be replaced with func(namespace, cloud, resourceName string) ([]*paragliderpb.PermitListRule, error) (gocritic)
pkg/client/client.go:110:1: paramTypeCombine: func(namespace string, cloud string, resourceName string, rules []*paragliderpb.PermitListRule) error could be replaced with func(namespace, cloud, resourceName string, rules []*paragliderpb.PermitListRule) error (gocritic)
pkg/client/client.go:127:1: paramTypeCombine: func(namespace string, cloud string, resourceName string, rules []string) error could be replaced with func(namespace, cloud, resourceName string, rules []string) error (gocritic)
pkg/client/client.go:144:1: paramTypeCombine: func(namespace string, cloud string, resourceName string, resource *paragliderpb.ResourceDescriptionString) (map[string]string, error) could be replaced with func(namespace, cloud, resourceName string, resource *paragliderpb.ResourceDescriptionString) (map[string]string, error) (gocritic)
pkg/client/client.go:250:1: paramTypeCombine: func(tag string, member string) error could be replaced with func(tag, member string) error (gocritic)
pkg/utils/utils.go:115: line is 136 characters (lll)
pkg/utils/utils.go:117: line is 176 characters (lll)
pkg/utils/utils.go:128:3: unlabelStmt: label out is redundant (gocritic)
12 issues:
* bodyclose: 1
* gocritic: 7
* lll: 3
* stylecheck: 1