Change 'pg_ctl: no server running' Exit Status to 3

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According to Linux Standard Base Core Specification 3.1 [1], the exit
status should be '3' when the server isn't running.

I've attached a very simple patch that resolves this cosmetic issue,
which applies to all branches.

My initial search regarding other platforms has turned up nil. It looks
like they just check for a zero or non-zero exit status.

As for the necessity of the patch: Gentoo Linux uses pg_ctl in all of
its initscript actions for PostgreSQL. I'd imagine that Gentoo is not
the only distribution that takes advantage of pg_ctl for its initscript
actions.

Sincerely,
    Mr. Aaron W. Swenson

[1]
http://refspecs.freestandards.org/LSB_3.1.1/LSB-Core-generic/LSB-Core-generic/iniscrptact.html
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