bump go to 1.2.1 in the Dockerfile

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
runtime: Fix unique constraint error checks

The sqlite3 version in fedora (3.8) returns a different error string in the unique constraints
failure case than the one in hack/ (3.7). This updates the check to detect both, fixing
one integration check failure on Fedora.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
aufs: Skip tests if aufs not supported

This makes it possible to pass the rest of the testsuite without aufs in the kernel.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
Merge pull request #4420 from unclejack/bump_to_go_1.2.1

Bump Go to 1.2.1 in the Dockerfile
Merge pull request #4200 from alexlarsson/fix-fedora-tests

Fix fedora tests