Description of problem:

On FC6 system-config-lvm does not allow ext3 filesystems on LVs to be expanded
because it wrongly assumes that ex2online is still used to expand online ext2/3
volumes.

Version-Release number of selected component (if applicable):
system-config-lvm-1.0.18-1.2.FC6

How reproducible:
Quite.

Steps to Reproduce:

1. Attempt to expand a LV that has an ext3 filesystem in it by clicking on the
"Edit Proprerties" button. 
2. Attempt to increasing the size.
  
Actual results:
system-config-lvm does not allow the volume to be expanded.

Expected results:
system-config-lvm does allows the volume to be expanded.

Additional info:
As of FC6 the online expanding functionality that was in ext2online has been
moved to resize2fs, but system-config-lvm still checks for the existence of
resize2fs to determine whether online expansion of ext2/3 is supported (see
section 7.3):
  http://video.linux-noob.com/screenshots/fedora/6/RELEASE_NOTES_en_US.html
Consequently all references to ext2online in system-config-lvm should be changed
to resize2fs.