Use goss for healthchecks (#223)

* basic healthcheck based on goss
* add goss to travis
* healtcheck command runs now for all services
* add to makefile

core/defaultconfigs/kapi.py

@@ -0,0 +1,18 @@
+import os
+import kcconf
+
+# Component specific configurations
+kcconf.configkopano({
+    r"/etc/kopano/kapid.cfg":
+    {
+        'log_level': "info",
+        'listen': "0.0.0.0:8039",
+        'DEFAULT_PLUGIN_PUBS_SECRET_KEY_FILE': "/kopano/ssl/kapid-pubs-secret.key",
+        'plugin_kvs_db_datasource': "/kopano/data/kapi-kvs/kvs.db",
+        'plugin_grapi_socket_path': "/var/run/kopano/grapi"
+
+    }
+})
+
+# Override configs from environment variables
+kcconf.configkopano(kcconf.parseenvironmentvariables(r"/etc/kopano/"))