fixed the issue when -l is specified as '/'

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/branches/2.7@12193 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

xCAT-server/lib/xcat/plugins/aixinstall.pm

@@ -4900,6 +4900,10 @@ sub chk_resolv_conf
    			my $install_dir = xCAT::Utils->getInstallDir();
             if ($::opt_l)
             {
+                if ($::opt_l =~ /\/$/)
+                {
+                    $::opt_l =~ s/\/$//; #remove tailing slash if needed
+                }
                 $loc = "$::opt_l/resolv_conf/$resolv_conf_name";
             }
             else