get Haraka version from utils.getVersion (3x)

[msimerson]

which includes the git commit ID, when Haraka is running from a git repo.

❯ ./bin/haraka -v
Haraka.js — Version: 3.0.3/e627f3b9

and

Starting up Haraka version 3.0.3/75fc8afc

also

• remove last vestiges of header_hide_version (long ago renamed)
• server.js: use the local logger methods

Checklist:

• [x] Changes updated