repogetbranch: Use gitgetbranch as branch fallback
repogetbranch: Use gitgetbranch as branch fallback

Change-Id: I8768573061b494101ac84f182861a2cddb8bc815
Signed-off-by: Adrian DC <01fb3892f39957945220431e7409156544d2f041@gmail.com>

AdrianDC/android_development_shell_tools,AdrianDC/android_development_shell_tools