iowatcher: Move iowatcher.1 into doc directory

iowatcher's manpage wasn't being installed with the other manpages so
add it to the doc directory.

Signed-off-by: Andrew Price <anprice@redhat.com>
diff --git a/iowatcher/iowatcher.1 b/doc/iowatcher.1
similarity index 100%
rename from iowatcher/iowatcher.1
rename to doc/iowatcher.1