Update containerd to 8517738ba4b82aff5662c97ca4627e7e4d03b531

This version:
 - properly follow context cancellation on Start and Exec
 - add support for Solaris
 - ensure exec exit events are always seen before init's

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

hack/dockerfile/install-binaries.sh

@@ -4,7 +4,7 @@ set -x
 
 TOMLV_COMMIT=9baf8a8a9f2ed20a8e54160840c492f937eeaf9a
 RUNC_COMMIT=ac031b5bf1cc92239461125f4c1ffb760522bbf2
-CONTAINERD_COMMIT=52ef1ceb4b660c42cf4ea9013180a5663968d4c7
+CONTAINERD_COMMIT=8517738ba4b82aff5662c97ca4627e7e4d03b531
 GRIMES_COMMIT=fe069a03affd2547fdb05e5b8b07202d2e41735b
 LIBNETWORK_COMMIT=0f534354b813003a754606689722fe253101bc4e
 VNDR_COMMIT=f56bd4504b4fad07a357913687fb652ee54bb3b0

vendor.conf

@@ -96,7 +96,7 @@ google.golang.org/cloud dae7e3d993bc3812a2185af60552bb6b847e52a0
 github.com/docker/docker-credential-helpers f72c04f1d8e71959a6d103f808c50ccbad79b9fd
 
 # containerd
-github.com/docker/containerd 52ef1ceb4b660c42cf4ea9013180a5663968d4c7
+github.com/docker/containerd 8517738ba4b82aff5662c97ca4627e7e4d03b531
 github.com/tonistiigi/fifo 1405643975692217d6720f8b54aeee1bf2cd5cf4
 
 # cluster