repocomparetags: Store FETCH_HEAD sha1 identifiers
repocomparetags: Store FETCH_HEAD sha1 identifiers

Change-Id: I74d42075b3177059869f9f469e73dad8cffb95fe
Signed-off-by: Adrian DC <01fb3892f39957945220431e7409156544d2f041@gmail.com>

AdrianDC/android_development_shell_tools,AdrianDC/android_development_shell_tools