Further tweaks for univention app (#264)

* add option to change base path
* fix env name
* add kweb configuration for using konnect in a subpath
* make webapp display configurable
* more explicit startup messages
* add ability to use an external oidc provider
* install the grapi ldap backend in the image when building with a recent enough kopano version
* add the ability to run test in the konnect container
  * the startup script gets more and more complicated, there should be a way to test it
* test some values and add test helper
* do not simply cat the registration, but call with yq
* update kweb and konnect

konnect/test-helper.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+# add a dummy for the konnectd binary
+cat << 'EOF' > /commander/konnectd
+#!/bin/sh
+echo konnectd $@
+EOF
+
+chmod +x /commander/konnectd
+
+exit 0