Jenkinsfile: add  option to remove all images -a
Jenkinsfile: add  option to remove all images -a

opencb/opencga,j-coll/opencga,j-coll/opencga,opencb/opencga,j-coll/opencga,j-coll/opencga,opencb/opencga,j-coll/opencga,opencb/opencga,opencb/opencga,opencb/opencga,j-coll/opencga