Revert r252694 from stable/10 to fix instabilities seen with jemalloc + dhclient/sshd.
Revert r252694 from stable/10 to fix instabilities seen with jemalloc + dhclient/sshd.

This is a direct commit to stable/10 as the VM code has changed
since the stable/10 branch.

PR:		kern/185046

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase