Merge branch 'update_nmh' into 'master'

Update nmh jpp version to 12.1.2

See merge request common/dockerfiles!4

base/nmh:dev

-FROM docker.km3net.de/jpp-root6-py2:v11.0.0-rc8
+FROM docker.km3net.de/jpp-root6-py2:v12.1.2
  MAINTAINER Tamas Gal <tgal@km3net.de>
   
  RUN yum install -y gsl-devel && yum clean -y all