Remove socketOption functionality

Removed the setSocketOption() and socketOption(0 methods as they are
not really relevant for web sockets. Also, internally for the underlying real
socket the LowDelayOption and KeepAliveOption are already set.
If ever needed, these methods can be added later.

Change-Id: Ibfa279990c5277970eaa2dbc2dd3a7d0cce7154e
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>