vmware: Use exc_info when logging exceptions

There were several instances where we were logging exceptions as a
string, but from the context a full stack trace was intended. This
change updates these to use exc_info, which logs the exception with a
full stack trace.

Change-Id: I93ac0208c3643ac90ffb36e50ad59f49c66ad88b
Merge "vmware: Use exc_info when logging exceptions"