Description of problem:

mkinitrd does not add raid modules to the kernel ramdisk if /etc/raidtab has 
been formatted with spaces instead of tabs.

Version-Release number of selected component (if applicable):

version 3.4.28


How reproducible:

Every time

Steps to Reproduce:
1. Convert a non-raid SCSI server to a raid based system following common how-
to's
2. When creating /etc/raidtab, indent lines with spaces instead of tabs. 
Specifically, indent the 'raid-level' line using spaces and no tabs
3. run mkinitrd
    
Actual results:

mkinitrd does not recognize the raid level specificed in raidtab, so does not 
add raid(x) and raidstart commands to linuxrc

Expected results:

mkinitrd should recognize raid-level lines that are not indented, or are 
indented with spaces or tabs


Additional info:

The problem is due to this grep in mkinitrd:

        for number in $(grep '^[        ]*raid-level' /etc/raidtab 2>/dev/null |
                          awk '{print $2}' | LC_ALL=C sort -u) ; do

You can't tell from the text above, but there is a single tab character in the 
grep regex ^[ ]  pattern.