tests/admin-test.sh: add #!/bin/sh
tests/admin-test.sh: add #!/bin/sh

This is executable and appears to be intended to be executed directly,
so it should have a #! line.

GNOME/ostree,gatispaeglis/ostree,GNOME/ostree,gatispaeglis/ostree,GNOME/ostree,gatispaeglis/ostree,gatispaeglis/ostree,GNOME/ostree,gatispaeglis/ostree,gatispaeglis/ostree,GNOME/ostree