Use generic SLP service name for both SMT and SUSE Manager (fate#316384)

SLP `service:susemanager` identification is not generic and cannot be used by SMT, use `service:registration.suse` instead which works for both `service:registration.suse:manager` and `service:registration.suse:smt`. See [fate#316384](https://fate.suse.com/316384).

- fix for a namespace bug
- 3.1.32