Unifiy service label in legacy service gateway

split the service_label (e.g. postgresql or postgresql-9.2) to get the label (e.g. postgresql)

ccng (v2) plan 100/200 yeti-test passed
ccng (v1) plan 100       yeti-test passed
cc           plan free       yeti-test passed

ad-hoc test:
    - service recovery test(to test update_handle api): passed.

Change-Id: I39e9a12aad934367a54d090e8027a88ffd4e12f0