Add basic feature to mirror POS DB in mysql or postgresql

but only supported for Catapult so far

machines/theo-server/deploy/theo-common/mirror-catapult-first.sh.mako

@@ -0,0 +1,16 @@
+#!/bin/sh -e
+
+# sanity check
+if [ "$USER" != 'rattail' ]; then
+    echo ''
+    echo "Please run this script as 'rattail' user:"
+    echo ''
+    echo "   sudo -u rattail $0"
+    exit 1
+fi
+
+cd ${envroot}
+
+RATTAIL_ONAGER='bin/rattail-onager -c app/quiet.conf -P --no-versioning'
+
+$RATTAIL_ONAGER import-catapult --dbkey production --warnings