TT#72351 Stop running ngcpcfg within the testrunner

As the package is now installed by default, and we expect
«ngcpcfg build» to be executed after any installation upgrade anyway,
we can stop running this, more so now that we do not require any local
customization support.

Change-Id: Ic0984052f86e5aaddf384f36374fb259c946cb56

testrunner

@@ -19,8 +19,10 @@ fi
 rm -f /usr/sbin/goss
 ln -s "/usr/sbin/${goss}" /usr/sbin/goss
 
-diag "Rebuilding test configs in /etc/ngcp-system-tests/"
-ngcpcfg build /etc/ngcp-system-tests/* 2>&1
+if ! [ -d /etc/ngcp-system-tests/ ]; then
+  diag "Missing system test suite files, please run 'ngcpcfg build'"
+  exit 1
+fi
 
 rm -rf "${REPORT_DIRECTORY}"
 mkdir -p "${REPORT_DIRECTORY}"