webadmin: fixed iscsi storage dialog spacing

PatternFly patch caused some spacing issues in iscsi
storage dialog and attach virtual disk dialog. Fixed.

Bug-Url: https://bugzilla.redhat.com/1095374

Change-Id: I6aba6206a4d32ae3df935c4aadc524d980d5c2f5
Signed-off-by: Greg Sheremeta <gshereme@redhat.com>