Logging audit for guestagent/strategies module

Adjust logging to conform to logging standards.
Cleaned up some messages that were unclear. Changed
some messages from info to debug if they are
benign and expected.

Change-Id: Ibc79699bd3fbe9528c67566acdc683b33ac23f3f
Partial-Bug: #1324206
Merge "Logging audit for guestagent/strategies module"