remove the code that erase tftp-server rpm since the native tftp (tftp-server) is using in the 2.7

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@11486 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

xCAT/postscripts/servicenode

@@ -129,14 +129,12 @@ if ($::osname eq 'AIX')
 else
 {
 	# Linux setup
-	#  remove OpenIPMI-tools and tftp
+	#  remove OpenIPMI-tools
 	#  install xcat from /install/xcat
 	#  Copy Certificates, and config file to apprpriate directories 
 	#  from /install and restart xcatd
 	&runcmd("rpm -e OpenIPMI-tools");
 
-	&runcmd("rpm -e tftp-server");
-
          &copycerts;
         
        `logger -t $::sdate servicenode:  running xcatserver -d`;