Fix checkconfig to handle kernel memory cgroup name change

src/lxc/lxc-checkconfig.in

@@ -68,6 +68,15 @@ print_cgroups() {
 }
 
 CGROUP_MNT_PATH=`print_cgroups cgroup /proc/self/mounts | head -1`
+KVER_MAJOR=$($GREP '^# Linux' $CONFIG | \
+    sed -r 's/.* ([0-9])\.[0-9]{1,2}\.[0-9]{1,3}.*/\1/')
+if [[ $KVER_MAJOR == 2 ]]; then
+KVER_MINOR=$($GREP '^# Linux' $CONFIG | \
+    sed -r 's/.* 2.6.([0-9]{2}).*/\1/')
+else
+KVER_MINOR=$($GREP '^# Linux' $CONFIG | \
+    sed -r 's/.* [0-9]\.([0-9]{1,3})\.[0-9]{1,3}.*/\1/')
+fi
 
 echo -n "Cgroup: " && is_enabled CONFIG_CGROUPS yes
 
@@ -80,22 +89,18 @@ fi
 echo -n "Cgroup device: " && is_enabled CONFIG_CGROUP_DEVICE
 echo -n "Cgroup sched: " && is_enabled CONFIG_CGROUP_SCHED
 echo -n "Cgroup cpu account: " && is_enabled CONFIG_CGROUP_CPUACCT
-echo -n "Cgroup memory controller: " && is_enabled CONFIG_CGROUP_MEM_RES_CTLR
+echo -n "Cgroup memory controller: " 
+if [ $KVER_MAJOR -ge 3 -a $KVER_MINOR -ge 6 ]; then
+    is_enabled CONFIG_MEMCG
+else
+    is_enabled CONFIG_CGROUP_MEM_RES_CTLR
+fi
 is_set CONFIG_SMP && echo -n "Cgroup cpuset: " && is_enabled CONFIG_CPUSETS
 echo
 echo "--- Misc ---"
 echo -n "Veth pair device: " && is_enabled CONFIG_VETH
 echo -n "Macvlan: " && is_enabled CONFIG_MACVLAN
 echo -n "Vlan: " && is_enabled CONFIG_VLAN_8021Q
-KVER_MAJOR=$($GREP '^# Linux' $CONFIG | \
-    sed -r 's/.* ([0-9])\.[0-9]{1,2}\.[0-9]{1,3}.*/\1/')
-if [[ $KVER_MAJOR == 2 ]]; then
-KVER_MINOR=$($GREP '^# Linux' $CONFIG | \
-    sed -r 's/.* 2.6.([0-9]{2}).*/\1/')
-else
-KVER_MINOR=$($GREP '^# Linux' $CONFIG | \
-    sed -r 's/.* [0-9]\.([0-9]{1,3})\.[0-9]{1,3}.*/\1/')
-fi
 echo -n "File capabilities: " &&
     ( [[ ${KVER_MAJOR} == 2 && ${KVER_MINOR} < 33 ]] &&
        is_enabled CONFIG_SECURITY_FILE_CAPABILITIES ) ||