Eventscripts: remove unnecessary absolute paths from external commands.

Eventscripts: remove unnecessary absolute paths from external commands.

For eventscript unit testing it will be necessary to override external
commands to allow stub implementations to be used.  If absolute paths
aren't used then this can be done using either a fake bin/
subdirectory or by using shell functions.

This removes all of the simple cases of absolute paths.

Signed-off-by: Martin Schwenke <martin@meltin.net>
Conflicts:

	config/ctdb.init
	config/events.d/50.samba

        Keep old code but remove absolute paths.

Signed-off-by: Martin Schwenke <martin@meltin.net>
(This used to be ctdb commit 05851d50b0078de8bf4691442d718825adca6fe8)