Update containerd to v1.1.7.

Signed-off-by: Lantao Liu <lantaol@google.com>

vendor.conf

@@ -2,13 +2,13 @@ github.com/beorn7/perks 4c0e84591b9aa9e6dcfdf3e020114cd81f89d5f9
 github.com/blang/semver v3.1.0
 github.com/boltdb/bolt e9cf4fae01b5a8ff89d0ec6b32f0d9c9f79aefdd
 github.com/BurntSushi/toml a368813c5e648fee92e5f6c30e3944ff9d5e8895
-github.com/containerd/cgroups fe281dd265766145e943a034aa41086474ea6130
+github.com/containerd/cgroups 5e610833b72089b37d0e615de9a92dfc043757c2
 github.com/containerd/console 4d8a41f4ce5b9bae77c41786ea2458330f43f081
-github.com/containerd/containerd 878924b9b5b2d5fc22a3bdbe93ac736f31618f44
+github.com/containerd/containerd v1.1.7
 github.com/containerd/continuity 7f53d412b9eb1cbf744c2063185d703a0ee34700
 github.com/containerd/fifo 3d5202aec260678c48179c56f40e6f38a095738c
 github.com/containerd/go-cni 40bcf8ec8acd7372be1d77031d585d5d8e561c90
-github.com/containerd/go-runc bcb223a061a3dd7de1a89c0b402a60f4dd9bd307
+github.com/containerd/go-runc 14606eb66abd9e834e3bd22a4f5f46a3aad54c54
 github.com/containerd/typeurl f6943554a7e7e88b3c14aad190bf05932da84788
 github.com/containernetworking/cni v0.6.0
 github.com/containernetworking/plugins v0.7.5
@@ -37,8 +37,8 @@ github.com/Microsoft/go-winio v0.4.5
 github.com/Microsoft/hcsshim v0.6.7
 github.com/opencontainers/go-digest 21dfd564fd89c944783d00d069f33e3e7123c448
 github.com/opencontainers/image-spec v1.0.1
-github.com/opencontainers/runc 6635b4f0c6af3810594d2770f662f34ddc15b40d
-github.com/opencontainers/runtime-spec v1.0.1
+github.com/opencontainers/runc 029124da7af7360afa781a0234d1b083550f797c
+github.com/opencontainers/runtime-spec 29686dbc5559d93fb1ef402eeda3e35c38d75af4
 github.com/opencontainers/runtime-tools 6073aff4ac61897f75895123f7e24135204a404d
 github.com/opencontainers/selinux v1.2.1
 github.com/pkg/errors v0.8.0