905649: subscription-manager does not work with dbus-python-1.1.1-1

Set of conditional imports is designed to account for the movement of
 the constants REQUEST_NAME_REPLY_PRIMARY_OWNER and
 REQUEST_NAME_REPLY_ALREADY_OWNER across the versions of dbus-python.
The change for the request name call replaces a call that was first
 depecated and then removed. The new call is backwards
 compatible at least to version dbus-python-0.83.0-8.fc15.x86_64