Merge pull request #112 from sureshsundriyal/master

Reduce session_data filesize and some minor cleanup.
[cmd] do not error out if filter exists, just enable it

  Defect Number:
    Reviewed By:
   Testing Done:
[filter] fix a filtering bug during tailing
[filter] add tests for filtering with append
[vmw_log] update the formats for the vmw_log format
[test] make the append file writable
[build] cleanup a test file
fix an uninitialized var