Bring debian packaging back to compat 7.
Bring debian packaging back to compat 7.

We need to support Ubuntu 10.04 and later.  10.04 supports only
up through debain/compat 7.

Change-Id: I47f55a91ef4b945519f0215f769eab57585f81f2
Reviewed-on: http://review.couchbase.org/12146
Tested-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>

uvenum/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,senthilkumaranb/libcouchbase,mody/libcouchbase,uvenum/libcouchbase,trondn/libcouchbase,mnunberg/libcouchbase,mody/libcouchbase,senthilkumaranb/libcouchbase,senthilkumaranb/libcouchbase,maxim-ky/libcouchbase,maxim-ky/libcouchbase,couchbase/libcouchbase,mnunberg/libcouchbase,trondn/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,trondn/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,avsej/libcouchbase,uvenum/libcouchbase,couchbase/libcouchbase,PureSwift/libcouchbase,uvenum/libcouchbase,maxim-ky/libcouchbase,signmotion/libcouchbase,kojiromike/libcouchbase,signmotion/libcouchbase,avsej/libcouchbase,mnunberg/libcouchbase,mody/libcouchbase,signmotion/libcouchbase,mnunberg/libcouchbase,PureSwift/libcouchbase,uvenum/libcouchbase,maxim-ky/libcouchbase,PureSwift/libcouchbase,avsej/libcouchbase,PureSwift/libcouchbase,kojiromike/libcouchbase,trondn/libcouchbase,avsej/libcouchbase,mody/libcouchbase,mnunberg/libcouchbase,trondn/libcouchbase,senthilkumaranb/libcouchbase,avsej/libcouchbase,signmotion/libcouchbase,kojiromike/libcouchbase