Fix error and add new feature on gbs dashboard build

Fix error and add new feature on gbs dashboard build
1. Change method to match buildlog file and spec file name
2. Add summary.log after one-repo-arch gbs build to use gbs build results in snapshot creation
   : gbsfullbuild-image-creation job will not be triggered if gbs build is failed
3. Fix error to find build error reason
4. update-gbs-meta/gbs-ref-fullbuild/gbsfullbuild-create-snapshot functionality will be alternatively done by gbs dashboard build
5. Fix job_buildmonitor.py to handle gbs dashboard build with same tag name
6. Add current time to 'gbs release build' tag name
7. Handle 'repo init/sync' failure case
   : as-is : job_gbsdbbuild_one_repoarch_build return fail
   : to-be : job_gbsdbbuild_one_repoarch_build return success but mark repo init/sync failure reason

Change-Id: Idd055cd94e194e7d2bad342b0254fa480eaab7ef