Replace "slave" to "standby" in documentation for consistent terminology.

Itagaki Takahiro <itagaki.takahiro@gmail.com>

Commit: 3fd839950a33a7d36ac83edf1f9cc6fb929d7649
Author: Itagaki Takahiro <itagaki.takahiro@gmail.com>
Date: 2010-06-07T02:01:09Z
Releases: 9.0.0
Replace "slave" to "standby" in documentation for consistent terminology.
Almost all of the terms in docs and messages were replaced, but still
remains in a few comments and README files in codes.

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