CFY-1363 added plugin installer assertions to test
CFY-1363 added plugin installer assertions to test

isaac-s/cloudify-manager,konradxyz/cloudify-manager,konradxyz/cloudify-manager,codilime/cloudify-manager,konradxyz/dev_fileserver,codilime/cloudify-manager,cloudify-cosmo/cloudify-manager,konradxyz/dev_fileserver,isaac-s/cloudify-manager,isaac-s/cloudify-manager,geokala/cloudify-manager,geokala/cloudify-manager,cloudify-cosmo/cloudify-manager,cloudify-cosmo/cloudify-manager,codilime/cloudify-manager