Print the VM name for which request is being processed.

[kerneltime]

This change prints the name for the VM that issued the request being served.

Testing:
make sure /etc/vmware/vmdkops/log_config.json is deleted
make deploy-esx
run docker volume ls

[root@promc-2n-dhcp24:~] 06/10/16 21:56:26 2795426 [Ubuntu 64-bit] [INFO   ] executeRequest 'list' completed with ret=[{u'Attributes': {}, u'Name': 'MyVolume'}, {u'Attributes': {}, u'Name': 'rg'}, {u'Attributes': {}, u'Name': 'radio2016'}, {u'Attributes': {}, u'Name': 'MyVolume2'}]

[kerneltime]

When we do use multiple threads this change should still work.
From: https://docs.python.org/2/library/threading.html

name
A string used for identification purposes only. It has no semantics. Multiple threads may be given the same name. The initial name is set by the constructor.

[andrewjstone]

LGTM

[pdhamdhere]

Nice. LGTM. Thanks!