Disable Seapilot processes by default and correct enable/disable.

This checkin changes sqgen (gensq.pl) so that Seapilot processes -- proxy,
health checks, the Qpid brokers, PTPA (for loggging), ... -- are
disabled by default.   The scripts sp_enable/sp_disable can be run
to enable or disable Seapilot.   These scripts are also modified to work
properly.

Addresses bug: #1318760

Change-Id: I6cfade5041054f3f19c86f04e8d86471d4dce518