Change to teuthology-suite -k

[Dan Mick <dmick@redhat.com>]

tl;dr: after https://github.com/ceph/teuthology/pull/394 is merged, -k
testing is no longer the default for teuthology-suite; if you want it,
specify it on the CLI or in the yaml.

Further explanation:

teuthology-suite, by default, currently adds a 'kernel:' stanza to the
yaml file that requests the 'testing' kernel branch be installed on the
test machines.  Currently, the only way to not affect the installed
kernel is to specify "-k -" on the teuthology-suite commandline (to
override the default "-k testing".

Since there are some tests where the particular version of the kernel is
not important (say, Calamari tests), and since vps'es often have a
suitable kernel, and since installing a kernel and rebooting is pretty
expensive, I've changed teuthology-suite so it no longer installs a
kernel by default.  The previous behavior is available by specifying "-k
testing" explicitly (or adding a kernel stanza to the yaml for the suite
in question).

All cron jobs on teuthology and magna002 have already been changed to
explicitly specify a kernel branch.--
Dan Mick, Filesystem Engineering
Inktank Storage, Inc.	http://inktank.com
Ceph docs: http://ceph.com/docs
-- 
Dan Mick, Filesystem Engineering
Inktank Storage, Inc.	http://inktank.com
Ceph docs: http://ceph.com/docs