Rework option set of vacuumlo

Michael Paquier <michael@paquier.xyz>

Commit: bfea331a5e1b993d22071fc1696e6e8811d2d0d4
Author: Michael Paquier <michael@paquier.xyz>
Date: 2018-08-28T12:42:45Z
Releases: 12.0
Rework option set of vacuumlo

Like oid2name, vacuumlo has been lacking consistency with other
utilities for its options:
- Connection options gain long aliases.
- Document environment variables which could be used: PGHOST, PGPORT and
PGUSER.

Documentation and code is reordered to be more consistent. A basic set
of TAP tests has been added while on it.

Author: Tatsuro Yamada
Reviewed-by: Michael Paquier
Discussion: https://postgr.es/m/c7e7f25c-1747-cd0f-9335-390bc97b2db5@lab.ntt.co.jp

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