Added "catch all" exception handling to vmdk-ops.py
Added "catch all" exception handling to vmdk-ops.py

This is a final catch-all exception handler, which simply
prints out exception info the logger.

Tested with manually adding exception right after ConnectLocal
and observing te proper backtraces in the log (a few of them, since
Watchdog was trying to restart the process)

BaluDontu/docker-volume-vsphere,luomiao/docker-volume-vsphere,venilnoronha/docker-volume-vsphere,pshahzeb/vsphere-storage-for-docker,lipingxue/docker-volume-vsphere,ashahi1/docker-volume-vsphere,brunotm/docker-volume-vsphere,pshahzeb/vsphere-storage-for-docker,brunotm/docker-volume-vsphere,shuklanirdesh82/docker-volume-vsphere,pshahzeb/vsphere-storage-for-docker,ashahi1/docker-volume-vsphere,shivanshu21/docker-volume-vsphere,venilnoronha/docker-volume-vsphere,venilnoronha/docker-volume-vsphere,BaluDontu/docker-volume-vsphere,shivanshu21/docker-volume-vsphere,govint/docker-volume-vsphere,ashahi1/docker-volume-vsphere,shuklanirdesh82/docker-volume-vsphere,brunotm/docker-volume-vsphere,shivanshu21/docker-volume-vsphere,govint/docker-volume-vsphere,lipingxue/docker-volume-vsphere,govint/docker-volume-vsphere,luomiao/docker-volume-vsphere,brunotm/docker-volume-vsphere,lipingxue/docker-volume-vsphere,shuklanirdesh82/docker-volume-vsphere,BaluDontu/docker-volume-vsphere,pshahzeb/vsphere-storage-for-docker,govint/docker-volume-vsphere,shivanshu21/docker-volume-vsphere,ashahi1/docker-volume-vsphere,govint/docker-volume-vsphere,venilnoronha/docker-volume-vsphere,venilnoronha/docker-volume-vsphere,ashahi1/docker-volume-vsphere,brunotm/docker-volume-vsphere,BaluDontu/docker-volume-vsphere,govint/docker-volume-vsphere,luomiao/docker-volume-vsphere,pshahzeb/vsphere-storage-for-docker,shivanshu21/docker-volume-vsphere,lipingxue/docker-volume-vsphere,lipingxue/docker-volume-vsphere,luomiao/docker-volume-vsphere,pshahzeb/vsphere-storage-for-docker,venilnoronha/docker-volume-vsphere,brunotm/docker-volume-vsphere,shuklanirdesh82/docker-volume-vsphere,shuklanirdesh82/docker-volume-vsphere,ashahi1/docker-volume-vsphere,BaluDontu/docker-volume-vsphere,luomiao/docker-volume-vsphere,shuklanirdesh82/docker-volume-vsphere,BaluDontu/docker-volume-vsphere,luomiao/docker-volume-vsphere,shivanshu21/docker-volume-vsphere,lipingxue/docker-volume-vsphere,BaluDontu/docker-volume-vsphere