Ensure sbin is in PATH.

Some distros (Debian) don't have sbin in PATH for non-root users.

Nova (and possibly other services) assumes that it can invoke "sysctl"
without sudo.

Change-Id: Iced21fc1378af309fb49688f9b63f2cd8383e304
Closes-Bug: #1300800
Allow heat standalone to work devstack stack

For functional testing of heat-standalone it is desirable for
heat to orchestrate on the rest of the cloud which is brought up
by devstack. This change makes the following changes to enable
this when HEAT_STANDALONE=True:

- Don't register the orchestration endpoint or create any dedicated
  heat accounts
- Install and configure the heat keystone V2 auth plugin instead of
  the default v3
- set heat.conf [clients_heat] url so that heat can call its own
  API when no orchestration endpoint is registered
- Modify create_userrc.sh to set the required heat client env
  variables to work with the standalone heat

Change-Id: Idae33bf1a9d550e2575e6390d2d7c8d3b94c401d
XenAPI: Upgrade built-VM to Trusty

If you're not using an XVA then the built-VM was previously Saucy, which is
not supported by openstack any more.

Change-Id: I1040d9e43d517582e76f2e1df787986b5ffbc42c
Merge "XenAPI: Upgrade built-VM to Trusty"
remove deprecated pip option

--build is a deprecated option in pip, remove it

Change-Id: I8cb5f570431dcbd3389cd3b8d54d9ef40aa66dee
Merge "Allow heat standalone to work devstack stack"
Merge "remove deprecated pip option"
Merge "Ensure sbin is in PATH."