#2 mod_authn_pam: make PAM service name configurable

[Joerg Wunsch]

(Enhancement request)

The attached patch makes the PAM service name used
configurable, instead of hard-coding it as "http".
This allows to re-use an existing service, but can
go as far as creating per-directory PAM configurations
using different PAM methods.

[Joerg Wunsch]

Suggested patch

[Joerg Wunsch]

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p.s.: I could not find the actual documentation that is used for the Web site docs,
so there's no doc patch included.