xenial ss: remove psycopg dependency

Related to #62.
Also, enable pip index to workaround #84, a we do in trusty

debs/xenial/archivematica-storage-service/Dockerfile

@@ -2,7 +2,7 @@ FROM ubuntu:xenial
 
 RUN apt-get update && \
     apt-get install -y dpkg-dev git build-essential wget debhelper \
-    devscripts equivs
+    devscripts equivs quilt
 
 RUN wget -O /tmp/pip.py https://bootstrap.pypa.io/get-pip.py && python /tmp/pip.py
 

debs/xenial/archivematica-storage-service/debian-storage-service/patches/remove-psycopg-requirement.diff

@@ -0,0 +1,10 @@
+Index: archivematica-storage-service/requirements/production.txt
+===================================================================
+--- archivematica-storage-service.orig/requirements/production.txt
++++ archivematica-storage-service/requirements/production.txt
+@@ -6,4 +6,3 @@
+ # in all cases (i.e. test.txt doesn't need them, but local and production do)
+ dj-database-url==0.4.2
+ mysqlclient==1.3.8
+-psycopg2==2.7.1
+\ No newline at end of file

debs/xenial/archivematica-storage-service/debian-storage-service/patches/series

@@ -0,0 +1 @@
+remove-psycopg-requirement.diff

debs/xenial/archivematica-storage-service/debian-storage-service/rules

@@ -4,4 +4,4 @@
 	dh $@ --with python-virtualenv --with systemd
 
 override_dh_virtualenv:
-	dh_virtualenv --extra-pip-arg --no-index --extra-pip-arg --find-links=lib 
+	dh_virtualenv --extra-pip-arg --find-links=lib