Make z-push configurable through env (#128)

* change current config changes to use php_cfg_gen
* add remaining (for kopano relevant config files)
* add autodiscover to z-push image
* add more autodiscover aliases to kweb

fixes #114 #39

zpush/Dockerfile

@@ -46,6 +46,8 @@ RUN \
         z-push-kopano \
         z-push-config-apache \
         z-push-kopano-gabsync \
+        z-push-autodiscover \
+        z-push-config-apache-autodiscover \
         ca-certificates \
         ${ADDITIONAL_KOPANO_PACKAGES} \
     && rm -rf /var/cache/apt /var/lib/apt/lists