vm/vmware: improve kernel log collection and VM management

* Collecting kernel logs with dmesg over ssh doesn't work well and
sometimes we miss call traces when a crash occurs. Getting the kernel
log from a virtual serial port is much more effective.
* Creating linked clone VMs is faster then full clone VMs but it
requires snapshot management and this will bring more complexity to
syzkaller. Keep it simple and create full clone VMs for now.
* Use host-only networking because the VM gets its IP faster that way

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