cleanup camelCase names

certlib and certdirectory internal names and method
names. Tests and callers updated as well.
cleanup camelCase args in handle_gui_exception

s/logMsg/log_msg, s/formatMsg/format_msg
cleanup camelCase names in progress.py
cleanup camelCase usage in networkConfig.py
cleanup camelCase usage in migrate.py
clean camelCase usage in gui/
cleanup camelCase usage in plugins.py

s/getPluginManager/get_plugin_manager
cleanup camelCase usage in managerlib.py
s/formatDate/format_date
cleanup camelCase usage in managercli.py

Also, sort new imports.
cleanup camelCase usage for hwprobe.py

Note: This module may be used by other tools, so
this may need further compatibilty testing.
cleanup camelCase usage, s/systemExit/system_exit
clean camelCase usage in certdirectory.py
cleanup camelCase usage in util.py

s/ioctl_GWINSZ/ioctl_gwinsz
cleanup camelCase usage in gui/utils.py

s/interpolatedStr/interpolated_str
cleanup camelCase in gui/utils.py

s/errorWindow/show_error_window

Change to show_error_window to make it more obvious it is
a wrapper method, and not a poorly named widget class.
cleanup all cap single letter methods in lock.py

P()/V() are traditional names, so leave them as
aliases, but use wait()/signal() for the defs
cleanup camelCase usage in migrate.py

also move FACT_FILE and YUM_PLUGIN_CONF to module
scope, since local vars shouldn't be all caps and
that usage is consistent with other modules.
use os.linesep as imported

It is a string constant so NEW_LINE was okay as well, but
this cleans up some odd imports.