Fixed the issue lpar_netboot.expect timeout on IVM controlled systems

Defect [2316981] : https://sourceforge.net/tracker/index.php?func=detail&aid=2316981&group_id=208749&atid=1006945

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@2512 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

xCAT-server/sbin/lpar_netboot.expect

@@ -1612,6 +1612,7 @@ proc boot_network {} {
         send_command
         expect {
             -i $spawn_id_rconsole
+            -nocase
             -re $pattern($state) {
                 nc_msg $msg($state)
                 set state $newstate($state)
@@ -1669,6 +1670,7 @@ proc Boot {} {
             set rc 5
             return
         }
+        -nocase
         -re {!([0-9A-F]+)} {
             send_user "$PROGRAM: The network boot ended in an error.\n"
             nc_msg $expect_out(buffer)