Allow IP:PORT in address lists

Signed-off-by: Michael Iedema <michael.iedema@rangenetworks.com>
Bug 1707 related changes - convert timestamps to use ISO date/time format.
(upstream r8170)
Allow an empty log level to mean use the default level.
This allows the CLI command "unconfig" on Log.Level.* or Log.Group.* to work as expected.
(upstream r8227)
No real code changes only to comments and logging for GPRS
(upstream r8287)