feat(profile): add profile for sshd session.

It is only a first draft as recent update in sshd, split sshd in multiple binaries,
it will allow us to also split the confinement in multiple profile.

apparmor.d/groups/ssh/sshd

@@ -69,7 +69,7 @@ profile sshd @{exec_path} flags=(attach_disconnected) {
   @{bin}/passwd                      Px,
   @{lib}/{openssh,ssh}/sftp-server   Px,
   @{lib}/{openssh,ssh}/sshd-auth     Px,
-  @{lib}/{openssh,ssh}/sshd-session  ix,
+  @{lib}/{openssh,ssh}/sshd-session  Px,
 
   @{etc_ro}/environment r,
   @{etc_ro}/security/limits.d/{,*.conf} r,