tests: helpers to run make check in containers

Add scripts that run make check in a container for a given operating
system version. They are a little more than oneliners and serve two
purposes:

  * help new developers who do not have to figure out which options
    should be used

  * run make check in containers in parallel with make -j2

Signed-off-by: Loic Dachary <ldachary@redhat.com>
tests: run-make-check.sh configure --without-lttng

Because, when run in a container it issues errors such as

libust[27179/27194]: Error: Error opening shm
  /lttng-ust-wait-5-1000 (in get_wait_shm() at lttng-ust-comm.c:919)

Signed-off-by: Loic Dachary <ldachary@redhat.com>
tests: add xmlstarlet in containers

It can be removed once https://github.com/ceph/ceph/pull/3228 is merged
and xmlstarlet is found in ceph.spec.in and debian/control.

Signed-off-by: Loic Dachary <ldachary@redhat.com>