Update python-ldap version for Keystone

We are currently pinned to an old version of python-ldap. Version
2.4 of python-ldap has been out for over 3 years now, and most
platforms are shipping it.  We should be testing against it instead
of using an old version.

Change-Id: Ifbbcfe2ccf2caa70758f75e44d526d23d7f466cb
Freeze mccabe's version for hacking

mccabe has some drastic changes on master that will not introduce
backwards incompatible behaviour but will make the tool more accurately
compute complexity for various situations. To prevent surprises Joe
Gordon and I have decided to freeze the version now.

Change-Id: I768b785cb61172eb857a7710064e262f007dd138
Merge "Freeze mccabe's version for hacking"
Update stevedore base version to 1.1.0

The 1.1.0 release of stevedore fixes a packaging issue that prevents the
documentation from some projects that use stevedore from building.
See Bug #1384919 for more details.

Change-Id: I1bd09144c6606e3aa9f0264143cca98265322cc3
New oslo library - oslo.concurrency

First development release of the new library containing
lockutils and processutils.

Change-Id: I04e819bef87836ce1b937d9a98b24e58d63f0079
Merge "Update python-ldap version for Keystone"
Merge "Update stevedore base version to 1.1.0"