script/sepia_bt.sh: get sha1,release from t.log if it's not in core

script/sepia_bt.sh: get sha1,release from t.log if it's not in core

* sometimes, the coredump comes from python, so we should get the sha1 and
  release in a different and more fragile way.
* also, the distro of Centos7 comes from python is "Centos Linux", so we
  should normalize its distro name and distro version.
* add "-v" option to be more chatty.
* normalize the $prog if $prog is */python*
* fix the pkg_path if the distro is centos7

Signed-off-by: Kefu Chai <kchai@redhat.com>