Bug 625 - Fixed Apache DM Activation after removing xtend code.

Bug 625 - Fixed Apache DM Activation after removing xtend code.

Apache DM does not provide any compile time/ runtime checks
for callbacks missing / modified.
Previously in xtend callbacks were provided by @Property
annotation, which generated setters and getters for this.

In refactor these was accidentally ommited. From code-perspective
it was not obvious that this affects Apache DM instantiation of
this service, since Apache DM uses strings and reflection.

Change-Id: I655ce7c1bc9971e3db370c5048057c1e6070a46d
Signed-off-by: Vaclav Demcak <vdemcak@cisco.com>