python linter: clean api/examples/getvolfile.py

	This series aim to reduce the python linter build logs.

	This commit silences most of the python linter complaints
without any functional changes. The changes include mostly formatting
and missing obvious docstrings. We left out dependency and exception
handling complaints on purpose to be addressed separately.

Signed-off-by: Thales Antunes de Oliveira Barretto <[email protected]>

Author: ThalesBarretto

api/examples/getvolfile.py

@@ -1,6 +1,8 @@
 #!/usr/bin/python3
+"""gfapi example for glfs_get_volfile()."""
 
 from __future__ import print_function
+
 import ctypes
 import ctypes.util
 
@@ -12,6 +14,7 @@
 
 
 def get_volfile(host, volume):
+    """Exercises glfs_get_volfile."""
     # This is set to a large value to exercise the "buffer not big enough"
     # path.  More realistically, you'd just start with a huge buffer.
     BUF_LEN = 0
@@ -30,6 +33,7 @@ def get_volfile(host, volume):
         return vlen
     return vbuf.value[:vlen]
 
+
 if __name__ == "__main__":
     import sys
 
@@ -42,4 +46,4 @@ def get_volfile(host, volume):
         for line in res.split('\n'):
             print(line)
     except:
-        print("bad return value %s" % res)
+        print(f"bad return value {res}")