Make dockerfiles a bit more consistent

... and add Mint 19 and CentOS 6. The latter currently fails in
ctng's configure due to an old libtool; need to make libtool
optional.

Signed-off-by: Alexey Neyman <stilor@att.net>

1 files changed, 8 insertions, 0 deletions

diff --git a/testing/docker/docker-remove-all.sh b/testing/docker/docker-remove-all.sh
new file mode 100755
index 00000000..d73ba1e6
--- /dev/null
+++ b/testing/docker/docker-remove-all.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+
+for c in `docker ps -a -q`; do
+    docker rm $c
+done
+for i in `docker images -q`; do
+    docker rmi --force $i
+done