linux kernel configuration amenable to docker

```diff
107c107,108
< # CONFIG_IKCONFIG is not set
---
> CONFIG_IKCONFIG=y
> CONFIG_IKCONFIG_PROC=y
110c111,125
< # CONFIG_CGROUPS is not set
---
> CONFIG_CGROUPS=y
> # CONFIG_CGROUP_DEBUG is not set
> CONFIG_CGROUP_FREEZER=y
> CONFIG_CGROUP_DEVICE=y
> CONFIG_CPUSETS=y
> CONFIG_PROC_PID_CPUSET=y
> CONFIG_CGROUP_CPUACCT=y
> CONFIG_RESOURCE_COUNTERS=y
> # CONFIG_MEMCG is not set
> CONFIG_CGROUP_SCHED=y
> CONFIG_FAIR_GROUP_SCHED=y
> # CONFIG_CFS_BANDWIDTH is not set
> # CONFIG_RT_GROUP_SCHED is not set
> CONFIG_BLK_CGROUP=y
> # CONFIG_DEBUG_BLK_CGROUP is not set
112c127,132
< # CONFIG_NAMESPACES is not set
---
> CONFIG_NAMESPACES=y
> CONFIG_UTS_NS=y
> CONFIG_IPC_NS=y
> CONFIG_USER_NS=y
> CONFIG_PID_NS=y
> CONFIG_NET_NS=y
220a241
> # CONFIG_BLK_DEV_THROTTLING is not set
252a274
> # CONFIG_CFQ_GROUP_IOSCHED is not set
916c938
< CONFIG_NETFILTER_XT_MATCH_ADDRTYPE=m
---
> CONFIG_NETFILTER_XT_MATCH_ADDRTYPE=y
917a940
> # CONFIG_NETFILTER_XT_MATCH_CGROUP is not set
1053a1077,1078
> # CONFIG_CGROUP_NET_PRIO is not set
> # CONFIG_CGROUP_NET_CLASSID is not set
1575c1600,1601
< # CONFIG_MACVLAN is not set
---
> CONFIG_MACVLAN=y
> CONFIG_MACVTAP=y
1581c1607
< # CONFIG_VETH is not set
---
> CONFIG_VETH=y
2071c2097
< # CONFIG_DEVPTS_MULTIPLE_INSTANCES is not set
---
> CONFIG_DEVPTS_MULTIPLE_INSTANCES=y
```