docker-playground[master]: ttcn3-{mgw, ggsn}-test: use VOL_BASE_DIR from jenkins-common.sh

[Harald Welte]

Patch Set 1: Code-Review+2

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Gerrit-MessageType: comment
Gerrit-Change-Id: Iee034df93bf8e8b995262749cf4654886032af2b
Gerrit-PatchSet: 1
Gerrit-Project: docker-playground
Gerrit-Branch: master
Gerrit-Owner: Neels Hofmeyr <nhofm...@sysmocom.de>
Gerrit-Reviewer: Harald Welte <lafo...@gnumonks.org>
Gerrit-HasComments: No