If parameters os_token and os_endpoint were passed to
ceilometerclient.client.get_client to construct a ceilometer client, the
token will be wrongly replaced with None in method
ceilometerclient.client._adjust_kwargs, which will cause the
authentication error when use the instance of ceilometer client later.
This patch fixed this problem.

Change-Id: Ib15cdd73b62b7f0b86d0bd6f19d344fd24a665f6
Closes-Bug: #1519729

Correct a nit doc string error which is populated into api reference
doc.

Change-Id: I53e2d5ea820891d90f522889743ce94802f0576e

Change-Id: Ia5e924eb58aac7fd53e9fe4a3dbdee102ece3ad7

When a keystone session object is used, if endpoint_type and interface
is provided, we must use interface and drops endpoint_type.

Change-Id: I379e18f684aa5092f8adbeaebe98030053115767

When a keystone session object is used API call are done twice.

This change fixes that.

Change-Id: I79815520b996bce954fe531193f1a0229ef30060

patch I4804c45c2ba69982163503ba5d9d4eba86f904fe has some typos in
docstring:

* :param *args: should be :param args:, there is no need to use the
  leading star, meanwhile the star has special meaning in doc string
  which need to appear by pairs.
* :param for this ceiloclient, actually this phase is part of last
  param's help string

Change-Id: Ib7b964ffe064b805130953f6a6abca354d9eef79

ceilometer client is a rare client that doesn't allow to use
a keystoneclient/keystoneauth session object.

This change fixes that and will allow to remove the
deprecated apiclient code in the future.

Depends-On: I43223a8b38ff1f4ef30c1d2345a28de6ade51863
Depends-On: I7cbe0afa12c9d11ce2eaed1f4d29f41507e273f8
Change-Id: I4804c45c2ba69982163503ba5d9d4eba86f904fe