[base image files] All 'docker exec' wrapper scripts now dynamically adjust their flags depending on whether or not they are run on a terminal (#1507)

dockers/docker-teamd/base_image_files/teamdctl

@@ -1,3 +1,10 @@
 #!/bin/bash
 
-docker exec -i teamd teamdctl "$@"
+DOCKER_EXEC_FLAGS="i"
+
+# Determine whether stdout is on a terminal
+if [ -t 1 ] ; then
+    DOCKER_EXEC_FLAGS+="t"
+fi
+
+docker exec -$DOCKER_EXEC_FLAGS teamd teamdctl "$@"