Add timer.py and display summary info in run.py.

Signed-off-by: Warren Usui <warren.usui@inktank.com>
nuke: blow away /home/ubuntu/cephtest too

(along with /tmp/cephtest)

Signed-off-by: Sage Weil <sage@inktank.com>
Merge branch 'master' of github.com:ceph/teuthology
install: fix branch/tag/sha1 selection

We were only allowing selection of packages by branch!

Signed-off-by: Sage Weil <sage@inktank.com>
install: poll for packages if wait-for-package: true

If the yaml has

 wait-for-package: true

then block and poll for the packages to appear if they are not already
there.  This is only useful for new branches or explicit sha1's, obviously.

Signed-off-by: Sage Weil <sage@inktank.com>