Added API versioning backwards compability and tests.

Change-Id: I8a7b512bea67e07e449074a4d04c257b65ae1454
diff --git a/full/src/test/resources/kustvakt-test.conf b/full/src/test/resources/kustvakt-test.conf
index 304e649..9a522ba 100644
--- a/full/src/test/resources/kustvakt-test.conf
+++ b/full/src/test/resources/kustvakt-test.conf
@@ -12,6 +12,8 @@
 ldap.config = file-path-to-ldap-config
 
 # Kustvakt
+
+current.api.version = v1.0
 # multiple versions separated by space
 supported.api.version = v0.1 v1.0