Merge pull request #5535 from vmarmol/add-maintainers-cgroup

Adding Rohit Jnagal and Victor Marmol to pkg/cgroups maintainers.

pkg/cgroups/MAINTAINERS

@@ -1 +1,3 @@
 Michael Crosby <michael@crosbymichael.com> (@crosbymichael)
+Rohit Jnagal <jnagal@google.com> (@rjnagal)
+Victor Marmol <vmarmol@google.com> (@vmarmol)