Remove router actions from Admin panel

add-interface/set-gateway/create-router actions in Admin Router panel
are no longer needed since all of these operations now can be done by
regular users. Moreover, there is a bug that admin cannot add an
interface of other tenant to a router in Admin Router panel and the
behavior is confusing for users.

Consindering the above, this commit remove forms create/modifying
quantum routers. After the commit admin router panel just provides
the list of routers of all tenants and removes them.

Fixes bug #1153754

Change-Id: Ie17601b260fc6584ba21cd19dc9492bf16b267c1
Fix device name for example. Fixes bug 1152975

Change-Id: Ib83ae8945df054c1a5cb54d118061d428ac15cd1
Merge "Remove router actions from Admin panel"
Merge "Fix device name for example. Fixes bug 1152975"