ctdb tool - simplify main() by taking most code out of a loop

ctdb tool - simplify main() by taking most code out of a loop

Most of the action in main() happens inside a for loop and an if
statement.  This causes 2 levels of extra indent for the code and
makes it harder to read.

Instead, the current body of the loop is put below the loop and its
corresponding failure check.

To see how small this change really is, view with "diff -w".  ;-)

Signed-off-by: Martin Schwenke <martin@meltin.net>
(This used to be ctdb commit 8527396b7290cfc8378779631e91d2ae09e2a106)