Remove a few of the 'import *' statements

There are various 'import *' statements scattered through the code which
generally are not a good thing. These are some of the more straight
forward ones to fix up, but it still leaves a few others that need a
closer look at before removing.
Remove 'import *' statement from back_mysql.py - NEEDS REVIEW
Remove 'import *' statement from portalocker.py - NEEDS REVIEW
Remove most unused import statements

The flake8 tool reported a lot of import statements where modules being
imported were never actually being used. After some basic checking,
these appear to be import statements that can be safely removed.
Cleanup the import statements in the tests

The flake8 tool reported a number of import statement with modules being
imported but not used, and the use of 'import *'. This is an attempt to
clean up some of these issues to the codebase in general.
Remove 'import *' statement from test/memorydb.py

It is generally best to avoid 'import *' statements, particularly in
this case where objects in the global namespace were then being
propagated through to an execfile(). The construction of the 'vars'
variable is a bit of a hack, but preferable to the alternative. Sometime
in the future it may be a good idea to do away with using execfile() to
parse the schema files.
Remove anypy.sets_

The anypy.sets_ package module is no longer used in the roundup codebase
because python v2.4 is no longer supported. The anypy VERSION has been
bumped to 0.2 to reflect this removal, but the version has probably
never changed when other features were added in the past so this bump
may be pointless.