Adding uncommitted flag to support post staged but not commit changes

Review Request #6879 — Created Feb. 1, 2015 and discarded — Latest diff uploaded

viettran1989
RBTools
master
rbtools

Problem:
While the common workflow is to post committed changes, some people have workflows where they want to post changes that are uncommitted, and have to resort to generating a diff manually and posting it using rbt post --diff-filename=.

This work would add an --uncommitted flag to rbt post that would generate diffs for uncommitted changes instead.

Approach:
Adding can_diff_committed capability to all clients, and let git set that to True to support it.
This revision simulate the behavior of svn, where we specify the tip to be --rbtools-working-copy so that git client know to remove the revision range out of the git commands.
In addition, to support this flag, --update, --diff-filename, and --guess-fields can't coexists, so the error is thrown when the user specifies those commands along with --uncommitted.
In order to view staged but uncommitted files, we need to add --cached to the git diff command.

Write an extra unit test to check that the git post --uncommitted works.
Verify that it throws error when --uncommitted and other options like --diff-filename,

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