Allow overriding USE_GET_PIP via env vars

devstack-gate wants to pre-cache and then use get-pip, but we can't
throw the flag currently. Make the flag default settable via env vars.

Change-Id: I661b52670b6ce494666cbdd611e4eee6b96c8321
Partial-Bug: #1254275
Move neutron cache dir into a function

Taking the model of Nova, this patch aims to move the cache directory
management into a function with the goal to reuse it somewhere else like
Grenade.

Change-Id: I93df52f69ef339e6528b88d88d4ea70e0b725893
Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
Shorten PKI token logging

Log only the first 12 characters of auth-token for the Swift
API, since PKI based auth-tokens from keystone can huge (>> 2K).

Also tidy up a comment.

Change-Id: Ib784e8ecdcb7e371fe03458c7fd82b4460fa82b9
Signed-off-by: Peter Portante <peter.portante@redhat.com>
Use the swift logging adapter for txn IDs

Change-Id: I2b2308eb9606279cffc1965fc3b86e9597d63e87
Signed-off-by: Peter Portante <peter.portante@redhat.com>
Merge "Allow overriding USE_GET_PIP via env vars"
Merge "Move neutron cache dir into a function"
Merge "Shorten PKI token logging"
Merge "Use the swift logging adapter for txn IDs"
Merge branch 'master' of git://github.com/openstack-dev/devstack into opendaylight