Added org selection support to various entities
Added navigation back to org listing
Using configure_entity func to handle lists and common locators
Updated function to select deselect entities
Merge branch 'master' into cr-subnet

Conflicts:
	robottelo/common/constants.py
	robottelo/ui/hosts.py
	robottelo/ui/operatingsys.py
	robottelo/ui/template.py
	tests/ui/test_computeresource.py
	tests/ui/test_template.py
Fixed missed common.constants conflict resolve
Updated CRUD and testcases arch, template, user for configure_entity
Added common locator entity_select and entity_checkbox and using common locators
cr-subnet:Fixed PEP8 as per travis
cr-subnet:Fixed few more PEP8
Merge pull request #307 from kbidarkar/cr-subnet

Added org selection support to various entities