Made all the necessary changes to pass new PEP8 standards.
Also cleaned up docstrings to conform to the HACKING stanards.
Change-Id: Ib8df3030da7a7885655689ab5da0717748c9edbe
Bug: 1030440
If password is defined in keyring, use it; otherwise, prompt for the
password. Keying is configured using command line switch,
--os-use-keyring or env(OS_USE_KEYRING).
* openstackclient/common/openstackkeyring.py
The abstract class for keyring, specifically for openstack. The
class is used to store encrypted password in keyring, without
prompting for keyring password. The encrypted password is
stored in ~/.openstack-keyring.cfg file.
* openstack-common.py
Update openstackkeyring library from openstack.common.
* openstackclient/shell.py
OpenStackClient.build_option_parser(): New boolean argument,
--os-use-keyring, default to env(OS_USE_KEYRING).
OpenStackClient.authenticate_user(): Get password from keyring,
if it is defined; otherwise, prompt for the password. If user
enter a password and keyring is enabled, store it in keyring.
OpenStackClient.init_keyring_backend(): New method to define
openstack backend for keyring.
OpenStackClient.get_password_from_keyring(): New method to
get password from keyring.
OpenStackClient.set_password_in_keyring(): New method go set
password in keyring.
* toos/pip-requires
Define keyring and pycrypto as one of dependent.
Change-Id: I36d3a63054658c0ef0553d68b38fefbc236930ef
