webadmin: fix alignment in New Cluster dialog / Optimization

New Cluster dialog / Optimization tab had alignment and spacing issues.
Fixed.

Change-Id: Iae1712442dec2988e51312461df4c8669441f4ea
Bug-Url: https://bugzilla.redhat.com/1123319
Signed-off-by: Greg Sheremeta <gshereme@redhat.com>