add backward compatible name generation, by no prefixing
[yang] Add backward compatible name generation, by no prefixing

Summary:
Because some projects, for not changing the API need a possibility to have name not in a form
<preifx>.<method>, but in a form <method>, it is possible now with a

Test Plan: Use for tposs_charging, or tposs_ldr

Reviewers: aschultz, vtarasen, skattelmann, akuleshov

Reviewed By: vtarasen

CC: mkraemer, aschultz

Differential Revision: https://review.tpip.net/D1271