specific code to monitor_inotify.c.
Both monitor_inotify.c and monitor_kqueue.c provide their functions
for adding and removing watches. Prefix these functions with monitor_.
Some effort was made to unify monitoring via kqueue and via inotify
APIs. Now both provide their implementation of add_watch() function.
I guess there are some logical bugs in vnode_process(). With this commit
it would be better provide code as is, and resolve bugs separately.
