Backport of the 3.5.0 daemon-hook quoting fix: only the shell-executed
hooks expand %RSYNC_*% tokens, and those expansions are shell-escaped so
a crafted module path / environment value cannot inject shell syntax.
Test: daemon-exec-rsync-env-shell-escape.
The code now derives all the struct defines, default value assignments,
parser-param defines, and lp_foo() accessor functions from a single list
of daemon parameters.
Andrew Tridgell