Fixes LP#903978 - Write testcases for test_server_actions (boundary)
Fixes LP#903978 - Write testcases for test_server_actions (boundary)

Adds test cases for reboot and rebuild of non-existing server

Made a few style-related fixups
Changed the error response code from 422 to 404 and converted the indentation
to 4 space width.
Added nonexistant server action tests for reboot and rebuild
Restored the deleted new lines.

Change-Id: I61d0ff23c90811467e7f710450e23bee53cf2e22

Added nonexistant server action tests for reboot and rebuild

Change-Id: I61d0ff23c90811467e7f710450e23bee53cf2e22

cisco-openstack/tempest,afaheem88/tempest,vmahuli/tempest,roopali8/tempest,afaheem88/tempest,yamt/tempest,rakeshmi/tempest,FujitsuEnablingSoftwareTechnologyGmbH/tempest,adkerr/tempest,CiscoSystems/tempest,bigswitch/tempest,pandeyop/tempest,vedujoshi/tempest,xbezdick/tempest,zsoltdudas/lis-tempest,JioCloud/tempest,Tesora/tesora-tempest,queria/my-tempest,akash1808/tempest,hayderimran7/tempest,danielmellado/tempest,neerja28/Tempest,nunogt/tempest,rakeshmi/tempest,afaheem88/tempest_neutron,roopali8/tempest,varunarya10/tempest,sebrandon1/tempest,Lilywei123/tempest,yamt/tempest,ebagdasa/tempest,jaspreetw/tempest,adkerr/tempest,itskewpie/tempest,hpcloud-mon/tempest,NexusIS/tempest,alinbalutoiu/tempest,tudorvio/tempest,vedujoshi/tempest,citrix-openstack-build/tempest,hayderimran7/tempest,openstack/tempest,pczerkas/tempest,masayukig/tempest,BeenzSyed/tempest,armando-migliaccio/tempest,zsoltdudas/lis-tempest,hpcloud-mon/tempest,Juraci/tempest,vmahuli/tempest,afaheem88/tempest_neutron,tudorvio/tempest,ntymtsiv/tempest,Vaidyanath/tempest,armando-migliaccio/tempest,jamielennox/tempest,flyingfish007/tempest,Juraci/tempest,cisco-openstack/tempest,izadorozhna/tempest,eggmaster/tempest,izadorozhna/tempest,redhat-cip/tempest,cloudbase/lis-tempest,Mirantis/tempest,CiscoSystems/tempest,queria/my-tempest,tonyli71/tempest,manasi24/jiocloud-tempest-qatempest,BeenzSyed/tempest,dkalashnik/tempest,pczerkas/tempest,LIS/lis-tempest,neerja28/Tempest,masayukig/tempest,sebrandon1/tempest,manasi24/jiocloud-tempest-qatempest,jaspreetw/tempest,citrix-openstack/build-tempest,bigswitch/tempest,jamielennox/tempest,rzarzynski/tempest,manasi24/tempest,varunarya10/tempest,cloudbase/lis-tempest,Lilywei123/tempest,NexusIS/tempest,danielmellado/tempest,JioCloud/tempest,citrix-openstack/build-tempest,Juniper/tempest,flyingfish007/tempest,Juniper/tempest,Mirantis/tempest,Vaidyanath/tempest,xbezdick/tempest,LIS/lis-tempest,vedujoshi/os_tempest,dkalashnik/tempest,openstack/tempest,redhat-cip/tempest,eggmaster/tempest,akash1808/tempest,ebagdasa/tempest,manasi24/tempest,vedujoshi/os_tempest,tonyli71/tempest,rzarzynski/tempest,citrix-openstack-build/tempest,nunogt/tempest,alinbalutoiu/tempest,FujitsuEnablingSoftwareTechnologyGmbH/tempest,pandeyop/tempest,ntymtsiv/tempest,itskewpie/tempest,Tesora/tesora-tempest