runner: different exit codes were added
misc: move variable to a proper module
misc: OpenStack authentication was moved to separete method
misc: services' endpoints getting from OpenStack now (instead of using constants)
misc: get rid of code execution when importing openstack module
misc: openstack.__init__ was refactored
Merge pull request #20 - hotfixes
Merge branch 'develop' into features/runner-exitcodes
Merge pull request #19 - exit codes were added for tests runner
fix: "Instance ... already exists" problem
fix: missed import was added
openstack: API request exception was renamed
openstack: waiting to delete instance was extracted
openstack: wait_deletion_for was refactored
openstack: response code was added to OpenStackApiError exception
misc: with_timeout decorator was parameterized
fix: for raising wrong exception
misc: comments were corrected for with_timeout decorator
openstack: exception handling was moved to more proper place
misc: _alarm_handler was moved