Add package connman

Add package connman

The ConnMan project provides a daemon for managing internet connections
within embedded devices running the Linux operating system. The
Connection Manager is designed to be slim and to use as few resources as
possible, so it can be easily integrated. It is a fully modular system
that can be extended, through plug-ins, to support all kinds of wired or
wireless technologies. Also, configuration methods, like DHCP and domain
name resolving, are implemented using plug-ins. The plug-in approach
allows for easy adaption and modification for various use cases.

The location for released tarballs is still unavailable due to the
recent kernel.org outage, hence the package obtains the sources from git
for now.

[Peter: Ensure it can only be selected with workable toolchains,
	use start-stop-daemon in initscript, and install cm if selected]
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>