[Bug 1331547] [NEW] No network when PXE booting with CIFS (Live)

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the initrd.lz\initrd\scripts\casper script has a bug

function
do_netmount() {

...
    if [ "${NETBOOT}" != "nfs" ] && do_cifsmount ; then
        rc=0
    elif do_nfsmount ; then
        NETBOOT="nfs"
        export NETBOOT
        rc=0
    fi
...

should be changed to
...
    if [ "${NETBOOT}" != "nfs" ] && do_cifsmount ; then
        export NETBOOT   ##<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
        rc=0
    elif do_nfsmount ; then
        NETBOOT="nfs"
        export NETBOOT
        rc=0
    fi
...

If we use netboot=cifs the variable NETBOOT is not exported and that impacts
initrd.lz\initrd\scripts\casper-bottom\23networking
that ends up recreating with delay and errors /etc/network/interfaces.
Next when Ubuntu boots Internet/Networking is not available.

seen in 
 ubuntu-14.04-desktop-amd64.iso
 ubuntu-14.04-desktop-i386.iso

** Affects: casper (Ubuntu)
     Importance: Undecided
         Status: New

-- 
No network when PXE booting with CIFS (Live)
https://bugs.launchpad.net/bugs/1331547
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