MT#11387 Switch Pre-Depends into Depends

Let's avoid Pre-Depends everywhere, in case of problems we can
re-add them iff needed, but as a starting point get rid of then.

Quoting Guillem:

Pre-Depends impose some harsh constraints on the package manager,
and consequently make upgrades harder. That's one of the reasons
in Debian any packager considering to add them needs to send a
mail to the debian-devel mailing list to see if there's any
problem with it.

postinst should never require Pre-Depends, preinst *might*
require them.

Change-Id: I174936d4b9784f0985641e6cb37db968d24180ae

debian/control

@@ -22,10 +22,10 @@ Standards-Version: 3.9.7
 
 Package: ngcp-sems
 Architecture: any
-Pre-Depends: ngcp-system-tools,
-             ${misc:Pre-Depends}
+Pre-Depends: ${misc:Pre-Depends}
 Depends: adduser,
          ngcp-prompts,
+         ngcp-system-tools,
          python,
          ${misc:Depends},
          ${shlibs:Depends}