Remove security_group_handler from doc.

Since the security_group_handler was removed from nova we should remove
this in the docs.

Change-Id: I2bce04d41ff449d52a5859dd05b2c33e2dcc234f
Eliminate more of ttylinux references.

fix bug 1177558

Change-Id: I403cb6c0ab1f6aa8dcebcb2200d5330fbe491727
Merge "Remove security_group_handler from doc."