Reworked pom files

Reworked pom files

Each pom (artifact) declares it's dependencies (internal and external)
No dependencies declared at parent POM level, only dependency Management.

Also moved the <modules> from distribution/opendaylight to the root pom.xml
distribution/opendaylight now builds entirely from dependencies

I have intentionally left some things in here I think are wrong,
because the goal of this commit is to reproduce the existing build
(which it does, I've checked).  Subsequent commits will clean up other things.

Change-Id: I358bdac1c0f6a59b37a418a811a30235967fdfdc
Signed-off-by: Tony Tkacik <ttkacik@cisco.com>