scripts: Remove duplicate code from init script to set tunables

scripts: Remove duplicate code from init script to set tunables

The tunable variables defined in CTDB configuration file are currently
set up from init script as well as part of "setup" event in 00.ctdb
eventscript.  Remove the duplication of this code and set tunable
variables only from setup event.  During the "setup" event, it's possible
that ctdb tool commands can timeout if CTDB daemon is not ready.  To guard
against such eventuality, wait till "ctdb ping" command succeeds before
executing any other ctdb tool commands.

Signed-off-by: Amitay Isaacs <amitay@gmail.com>