Make run_tests.sh for running unit tests

In other projects the run_tests.sh script is used for project
verification (ie running unit tests) However, because tempest didn't
have unit tests and is itself a test suite the run_tests.sh script was
used to execute the tempest tests. Now that we have unit tests starting
to trickle into tempest the run_tests.sh script can be used for it's
traditional purpose. So, this commit removes the tempest specific
functionality from run_tests.sh and makes it run the unit tests.

Partially implements bp unit-tests

Change-Id: Iac4e9d0908274a20c3d278b2c8d7e00949a1f36e
Add a run_tempest.sh script

This commit adds a run_tempest.sh script which is used for running
tempest in the same manner that used to be handled by run_tests.sh.

Partially implements bp unit-tests

Change-Id: Id03d198b888ebd3673b2ca6fa895164910a42c4c
Fix typo in ssh_floating.json for stress tests

check_interval was spelled check_inerval, missing the 't'
Closes bug #1267473

Change-Id: I2cbeba11d4389472925b30b2029e170c034cf44a
Merge "Fix typo in ssh_floating.json for stress tests"
Merge "Make run_tests.sh for running unit tests"
Merge "Add a run_tempest.sh script"