MT#11387 Switch from Pre-Dependency on ngcp-system-tools* to Depends

Since we invoke the ngcp-sercmd command only in the postinst
script and not in preinst it's ought to be enough to depend
on the ngcp-system-tools-* package, quoting Debian Policy,
section 7.2:

| Pre-Depends are also required if the preinst script depends
| on the named package. It is best to avoid this situation if possible.

As piuparts doesn't support resolving Pre-Dependencies yet
this also solves our failing piuparts runs.

Change-Id: Ife43bfb7547c3331d541723782d8b374894e30b5

debian/control

@@ -10,9 +10,9 @@ Homepage: git://git.mgm.sipwise.com/kamailio-conf-lua
 Package: lua-ngcp-kamailio
 Section: libs
 Architecture: any
-Pre-Depends: ngcp-system-tools
 Depends: lua-redis,
          lua-sql-mysql,
+         ngcp-system-tools-ce | ngcp-system-tools,
          ${misc:Depends},
          ${shlibs:Depends}
 Provides: ${lua:Provides}