osmocom-bb-host-master: install python-enum as fake_trx dependency

62825cc8eb4e26d58d32a0af72b17256b185af61 (osmocom-bb)
started to use the python module enum which not part of the standard
libary of python 2.

Change-Id: I70b7f1b43a1e121114a924c09614d6eddc801881

osmocom-bb-host-master/Dockerfile

@@ -13,10 +13,11 @@ RUN	apt-key add /tmp/Release.key && \
 	rm /tmp/Release.key && \
 	echo "deb " $OSMOCOM_REPO " ./" > /etc/apt/sources.list.d/osmocom-nightly.list
 
+# python-enum34 is a dependecy of fake_trx as long we're using python2
 ADD	$OSMOCOM_REPO/Release /tmp/Release
 RUN	apt-get update && \
 	apt-get install -y --no-install-recommends \
-		libosmocore-dev && \
+		libosmocore-dev python-enum34 && \
 	apt-get clean
 
 WORKDIR	/tmp