Changes

open5gs-master: install dependencies using apt-get build-dep

This is a 3-rd party project, which may introduce new dependencies
in the future.  Rather than maintaining our own list of packages
to install, let's employ 'apt-get build-dep'.  This tool parses
'debian/control' and installs all dependencies automatically.

Change-Id: I71ad7256116ee30f15aff38fd38588aa2bfab456
Related: SYS#5602

open5gs-master: ensure consistent install paths with '-latest'

This allows running TTCN-3 test cases against both '-latest' and
'-master' images using the same configuration files.

Change-Id: Ib4dcf3a9f77205dcdd0ff4932763e202cb89001c
Related: SYS#5602