Bug 4836 - tunnel's paths are not removed from ODL after tunnel status "Down" is...

Bug 4836 - tunnel's paths are not removed from ODL after tunnel status "Down" is reported

In a case when PCC reports tunnel has been shutdowned, but not removed
(LSP-ID=0, remove=false), ODL PCE should remove all previously reported
paths related to the tunnel as there are no paths signaled anymore.
Also, in this case PCC will not send report/s with explicit removal
of those paths.

Change-Id: I7b2c34431b094b27ac1fc55c2a75312e00868532
Signed-off-by: Milos Fabian <milfabia@cisco.com>
(cherry picked from commit 4381024781b5ecda601eee2217c8c10e4d61a6c8)