Do not install debug symbols

Labs uses a handbuilt nginx-extras package, which doesn't have
a -dbg installed (this slipped through during testing because
of weird interactions between labsdebrepo and this). Remove
debug symbols for now.

Labs proxies are going to switch to trusty soon enough, at which
point we will not need the hand built packages at all. Will
add this package back when that happens

Change-Id: Ib9cc687cdc4181f14eaaf9a5a3ae315fbd7438fc
Merge "Do not install debug symbols"