chore(requirements): change psycopg2 to psycopg2-binary to avoid warnings

Psycopg2 is being deprecated in favor psycopg2-binary or building and compiling the source. Let's go with psycopg2-binary for now.

Author: Cryptophobia

rootfs/requirements.txt

@@ -15,7 +15,7 @@ morph==0.1.2
 ndg-httpsclient==0.4.2
 packaging==16.8
 pyasn1==0.3.2
-psycopg2==2.7.3
+psycopg2-binary==2.7.5
 pyldap==2.4.37
 pyOpenSSL==17.5.0
 pytz==2017.2