Description of problem:

When you try to change daemon properties in redhat-config-cluster and
there are 3 cluster members, the daemon properties dialog refuses to
close, cited below.  When you select the cluquorumd tab, both
tiebreakers are greyed out - as should be (no tiebreaker is necessary
in odd-number clusters).  This problem prevents changing daemon log
levels as well as failover time from the GUI.

"Error: Disk Tiebreaker was selected but no Disk Ping Interval was
entered.  Please enter a disk Ping Interval (in seconds) for Disk
Tiebreaker."


Version-Release number of selected component (if applicable): 1.0.1-4
How reproducible: 100%

Steps to Reproduce:
1. Create a cluster with three members in redhat-config-cluster
2. Open daemon-properties dialog box.
3. Click 'OK'.
  
Actual results: Error message.
Expected results: Should work.


Additional info:

- The error is correct for 2 member clusters.

- The cluster GUI should only check for 'disk tiebreaker' in 2 member
clusters.  Perhaps it should have some default value.  The cluster
back-end software has a default of 2 seconds for the ping interval.

- The cluster GUI should only check for 'IP tiebreaker' in 2 and 4
member clusters - other supported node counts (3, 5, 6, 7, 8) never
need to check for any tiebreaker, as neither is used.