ogt: Update base image to debian buster

The OGT build setup and the physicial setup use now debian buster. Let's
update this container too to buster to avoid different versions of libs
during build and runtime (such as libasan).

Change-Id: If5adfb3c52ec5ded2adaca984e7a8c05f5866d34

osmo-gsm-tester/Dockerfile

@@ -1,7 +1,5 @@
 ARG	USER
-FROM	$USER/debian-stretch-jenkins
-# Arguments used after FROM must be specified again
-ARG	OSMOCOM_REPO_MIRROR="http://download.opensuse.org"
+FROM	$USER/debian-buster-jenkins
 
 MAINTAINER Pau Espin Pedrol <pespin@sysmocom.de>
 
@@ -77,15 +75,6 @@ RUN     cd /tmp && \
         make && \
         make install
 
-ARG	OSMOCOM_REPO="$OSMOCOM_REPO_MIRROR/repositories/network:/osmocom:/nightly/Debian_9.0/"
-
-COPY	.common/Release.key /tmp/Release.key
-
-RUN	apt-key add /tmp/Release.key && \
-	rm /tmp/Release.key && \
-	echo "deb " $OSMOCOM_REPO " ./" > /etc/apt/sources.list.d/osmocom-nightly.list
-
-ADD	$OSMOCOM_REPO/Release /tmp/Release
 RUN	apt-get update && \
 	apt-get install -y --no-install-recommends \
 		telnet \
@@ -135,14 +124,6 @@ RUN	cd osmo-gsm-tester && \
 	(git symbolic-ref -q HEAD && git reset --hard origin/$OSMO_GSM_TESTER_BRANCH || exit 1); \
 	git rev-parse --abbrev-ref HEAD && git rev-parse HEAD
 
-# Install osmo-ci.git/scripts to /usr/local/bin
-ADD http://git.osmocom.org/osmo-ci/patch /tmp/osmo-ci-commit
-RUN git clone https://git.osmocom.org/osmo-ci osmo-ci && \
-	cp -v $(find osmo-ci/scripts \
-		-maxdepth 1 \
-		-type f ) \
-	   /usr/local/bin
-
 # Copy several scripts and permission for osmo-gsm-tester:
 RUN     mkdir -p /usr/local/bin/ && cp osmo-gsm-tester/utils/bin/* /usr/local/bin/
 RUN     mkdir -p /etc/sudoers.d/ && cp osmo-gsm-tester/utils/sudoers.d/* /etc/sudoers.d/