[Dovecot] var_expand and pop3_logout_format

[Alexander Sabourenkov]

Hi.

-alpha2 broke the retr-byte-count field of the pop3_logout_format
with the following change:

-Added %R (reverse string) and %H (hash string) variable modifiers.

%R as modifier conflicts on expand with %R as retr-byte-count in 
pop3_logout_format

resulting in expanded strings like:

top=0/0, retr=1/ del=0/1, size=431


seen in -alpha3 -alpha4 cvs as of 04.11.2005
FreeBSD 5.4-R, both i386 and amd64

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