Fix regression of setting VIPADDRESS to 127.0.0.1

See redmine #3010, now it's set to the first address of non-loopback
interface. In addition we check for "bindtointerface" body common control
setting and use that address if available.
Make "bindtointerface" a body common control option.

Previously it was only for serverd and agent. Now it also controls the
VIPADDRESS used to identify the agent/executor/server, if it is found in the
list of network interfaces. Relevant bug redmine #3010.