Fix for services page
Fix for remove host not waiting until request submitted
Added remove_host_from_cluster() method to all mgmt_systems
Added _destroy_host() private method to vsphere to remove host from inventory
Added support for datafile file_handle passing in setup_customization_template()
Added new fixture @host_provisioning_setup_data to return the host provisioning data
Added page models and buttons

Added new page models for HostProvisionRequests
Added provision button handling in Hosts
Added click_on_datastores() method to host Detail class
Added new header menu for Requests
Added life cycle buttons to Mixin by default
Added modelling of all the host customization request page
Added new test_host_provisioning test

Added data file for customization
Fixed fixture to not cache file
Merge pull request #253 from psav/test_host_provisioning

Test host provisioning