Added and enabled gates for new fuel repos, removed non-applicable checks
Added and enabled gates for new fuel repos, removed non-applicable checks

To continue work on integration of Fuel-* projects in
OpenStack infrastructure.

* Following gates are added and enabled by this commit:
- gate-fuel-menu-pep8
- gate-fuel-menu-python27
- gate-network-checker-pep8
- gate-network-checker-python27
- gate-shotgun-pep8
- gate-shotgun-python27

* Following checks are removed by this commit:
- gate-fuel-agent-docs (no docs in this repo)

* Following checks are added by this commit:
- gate-fuel-ostf-python27 (non voting)

Change-Id: Iaf3326e8c56988b71602bdafeb0459d9d93cdf48

openstack-infra/project-config,Tesora/tesora-project-config,noorul/os-project-config,dongwenjuan/project-config,openstack-infra/project-config,noorul/os-project-config,dongwenjuan/project-config,Tesora/tesora-project-config