allow to use x-registry-auth header with enabled cors

Signed-off-by: Vladimir Bulyga <xx@ccxx.cc>
LXC TEMPLATE WILL CREATE MOUNT

Lxc driver was throwing errors for mounts where the mount point does not exist in the container.
This adds a create=dir/file mount option to the lxc template, to alleviate this issue.

Docker-DCO-1.1-Signed-off-by: Abin Shahab <ashahab@altiscale.com> (github: ashahab-altiscale)
Update AUTHORS file

Signed-off-by: Arnaud Porterie <arnaud.porterie@docker.com>
fix link to PACKAGERS.md
fix link from /hack/PACKAGERS.md to /project/PACKAGERS.md

Signed-off-by: Daehyeok Mun <daehyeok@gmail.com>
Add CONFIG_OVERLAYFS_FS to check-config.sh

Also, added some slight adjustment to the AUFS_FS output/note to make it more clear what it applies to.

Example output:
```console
$ ./contrib/check-config.sh
info: reading kernel config from /proc/config.gz ...

Generally Necessary:
- cgroup hierarchy: properly mounted [/sys/fs/cgroup]
- CONFIG_NAMESPACES: enabled
- CONFIG_NET_NS: enabled
- CONFIG_PID_NS: enabled
- CONFIG_IPC_NS: enabled
- CONFIG_UTS_NS: enabled
- CONFIG_DEVPTS_MULTIPLE_INSTANCES: enabled
- CONFIG_CGROUPS: enabled
- CONFIG_CGROUP_CPUACCT: enabled
- CONFIG_CGROUP_DEVICE: enabled
- CONFIG_CGROUP_FREEZER: enabled
- CONFIG_CGROUP_SCHED: enabled
- CONFIG_MACVLAN: enabled
- CONFIG_VETH: enabled
- CONFIG_BRIDGE: enabled
- CONFIG_NF_NAT_IPV4: enabled
- CONFIG_IP_NF_FILTER: enabled
- CONFIG_IP_NF_TARGET_MASQUERADE: enabled
- CONFIG_NETFILTER_XT_MATCH_ADDRTYPE: enabled
- CONFIG_NETFILTER_XT_MATCH_CONNTRACK: enabled
- CONFIG_NF_NAT: enabled
- CONFIG_NF_NAT_NEEDED: enabled

Optional Features:
- CONFIG_MEMCG_SWAP: enabled
- CONFIG_RESOURCE_COUNTERS: enabled
- CONFIG_CGROUP_PERF: missing
- Storage Drivers:
  - "aufs":
    - CONFIG_AUFS_FS: missing
      (note that some kernels include AUFS patches but not the AUFS_FS flag)
    - CONFIG_EXT4_FS_POSIX_ACL: enabled
    - CONFIG_EXT4_FS_SECURITY: enabled
  - "btrfs":
    - CONFIG_BTRFS_FS: enabled
  - "devicemapper":
    - CONFIG_BLK_DEV_DM: enabled
    - CONFIG_DM_THIN_PROVISIONING: enabled
    - CONFIG_EXT4_FS: enabled
    - CONFIG_EXT4_FS_POSIX_ACL: enabled
    - CONFIG_EXT4_FS_SECURITY: enabled
  - "overlayfs":
    - CONFIG_OVERLAYFS_FS: missing
```

Signed-off-by: Andrew Page <admwiggin@gmail.com>
Cleanup: fixes start response status code typo in examples

Signed-off-by: Andrew C. Bodine <acbodine@us.ibm.com>
Merge pull request #9218 from tianon/check-overlayfs

Add CONFIG_OVERLAYFS_FS to check-config.sh
Merge pull request #9187 from icecrime/update_authors_file

Update AUTHORS file
Merge pull request #8905 from 13W/x-registry-auth

allow to use x-registry-auth header with enabled cors
Merge pull request #9039 from ashahab-altiscale/8617-lxc-volume

Have lxc create mount points if they don't exist
Merge pull request #9219 from acbodine/cleanup-remote-api-docs-start

Cleanup: fixes start response status code typo in examples
Merge pull request #9203 from somaopensource/fix_link

fix link to PACKAGERS.md