vmm & vmd: drop "continue" flag to simplify running a vcpu.

vmm & vmd: drop "continue" flag to simplify running a vcpu.

There's no need to distinguish the "first" time running a vcpu from
the subsequent times because vmm(4) uses in-kernel state tracking
the last vm exit reason to optimize the logic for updating vcpu
registers from userland. While here, clean up the DPRINTF's to make
the Intel VMX logic similar to the AMD SVM.

ok mlarkin@