Revert "Remove traces of now unused host capabilities from scheduler"

This reverts commit ce3f9e5fa9cd05f3ee3bb0cc7d06521d05901cf4.

This commit caused problems in tripleo, nova-bm isn't able to launch
instance as they are being filtered out by ComputeCapabilitiesFilter.

Fixes bug #1326289

Change-Id: Icaae95eea78eff11cee34e8a3875d62b3cce0b60
VMware: spawn refactor - phase 1 - test for spawn

Adding a test case for spawn to ensure all the correct methods are
called.  This test will get further fleshed out with explicit
assertions of behavior along with additional factoring pertaining to
image handling and manipulation.

partial blueprint vmware-spawn-refactor

Change-Id: Ia137f1ea4b9fa43741cdd7d610831da8e5474d62
fix nova test_enforce_http_true unit test

When the nova policy patch was merged, causing
nova.tests.test_policy.PolicyTestCase.test_enforce_http_true to fail
randomly in the gate. The oslo has used the six.moves.urllib.request
instead of urllib2, but the patch didn't sync this in test_policy.

This related commit a88d9d5936aabc52046ed3ae566741422bfaed78.
Related-Bug: #1288178

Change-Id: I51b6bbf37b062edcf4c4b5f65adb8bfecd4a2eef
Merge "Revert "Remove traces of now unused host capabilities from scheduler""
Merge "VMware: spawn refactor - phase 1 - test for spawn"
Merge "fix nova test_enforce_http_true unit test"