Convert ironic, swift, and heat api tests to use global CONF object

This commit takes all the uses of config in the object_storage and
orchestration api tests and converts them to use the global CONF
object.

The _get_client_args() method from the base orchestration test class
is removed because it only uses the object attr config and isn't
actually used anywhere. So instead of converting it to use the global
object it is removed.

Partially implements bp config-cleanup

Change-Id: Ib8d7ad36047a1e752511bc4c5541d04ea61d6afc
Convert volume api tests to use global CONF object

This commit takes all the uses of config in the volume api tests
and converts them to use the global CONF object.

Partially implements bp config-cleanup

Change-Id: I258f0b4df1850ab4d2d670c297b9c43b6916d036
Convert thirdparty and stress tests to use global CONF object

This commit takes all the uses of config in the thirdparty and stress
tests and converts them to use the global CONF object.

Partially implements bp config-cleanup

Change-Id: I683577f133643f6159dbfe7295911d155b613f92
stop leaking tempdirs

test_wrappers built temp dirs for running tests, but never
cleaned them up. So your /tmp is very full of tempest code now.

Fix this with an add cleanup

Change-Id: I4c05ba16c524b844f3cf43cfe0969ddd20238486
Convert scenario tests to use global CONF object

This commit takes all the uses of config in the scenario tests and
converts them to use the global CONF object.

Partially implements bp config-cleanup

Change-Id: I1bac686587f1705901b653b07300077623ba9f21
Convert cli tests to use global CONF object

This commit takes all the uses of config in the cli tests and coverts
them to use the global CONF object.

Partially implements bp config-cleanup

Change-Id: I7a39839d7a4ebbf8372489507486ad2cac7f3adc
Convert all service clients to global CONF object

This commit takes the rest client and all subclass(all the service
clients) and converts all uses of config to the global CONF object.

Partially implements bp config-cleanup

Change-Id: I09525af4f1b308b91d45b7bbea05e0f734ea485c
Merge "stop leaking tempdirs"
Merge "Convert ironic, swift, and heat api tests to use global CONF object"
Merge "Convert volume api tests to use global CONF object"
Merge "Convert thirdparty and stress tests to use global CONF object"
Merge "Convert scenario tests to use global CONF object"
Merge "Convert cli tests to use global CONF object"
Merge "Convert all service clients to global CONF object"