Support for --file option for ssh queries.

Allows user to list files and attributes (ADDED,
MODIFIED, DELETED, RENAMED, COPIED) when querying for
patch sets.

Should provide an easy mechanism for some CI systems
to trigger only on certain file changes in larger
repositories.

Change-Id: I61b5203bc1ad1aec9c7d4458a44c207b99a1c4e3
6 files changed