Removed depreciated load_plugins.py module; changed all places where load_plugins was imported to now call api.load_plugins()

ipa

@@ -28,7 +28,7 @@ The CLI functionality is implemented in ipalib/cli.py
 import sys
 from ipalib import api
 from ipalib.cli import CLI
-import ipalib.load_plugins
+api.load_plugins()
 
 if __name__ == '__main__':
     cli = CLI(api)