Replace git pull with fetch and reset to avoid the merge logic in the
event that the layers repo in the published SDK we're updating to isn't
fast-forward merge from the local repo.
Also add gitignore and committer info during publish to avoid errors and
to be sure that the first commit has a dummy user in it.
[ YOCTO #9368 ]
Signed-off-by: Stephano Cetola <stephano.cetola@linux.intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
