Use compile-time paths in the manual pages

Replace the hard-coded paths for various BIND 9 files (configuration, pid, etc.) in the man pages and ARM with compile-time values using the sphinx-build replace system.

This is more complicated, because the restructured text specification doesn't allow |substitions| inside code-blocks, so for each specific file we had to create own substition which is sub-optimal, but it is only way how to do this without adding Sphinx extension.

(cherry picked from commit b42681c4)

Closes #2717 (closed)