Added integration testing workflow (pxe)

pxe tests makeup

added pxe_page to parameters

added exception

working TestManagementSystems class

copy template -> add template

bugfixes

minor

added iso datastores test

added setup_mngmnt_systems fixture (also to conftest)

commented lines removed; datastores renamed

parametrised datastores test, removed imput class

renamed

add template debugged

cycle added to datastores test

Respective changes in cfme_data.yaml.template