MFC: r316746 Add UEFI support to vmrun.sh

MFC: r316746 Add UEFI support to vmrun.sh

Adds:
 -E: Use UEFI mode
 -f: path to UEFI firmware image (default: path to uefi-edk2-bhyve package)
 -F: UEFI framebuffer size (default: w=1024,h=768)
 -L: IP to listen for VNC connections on (default: 127.0.0.1)
 -P: Port to listen for VNC connections on (default: 5900)
 -T: Enable tablnet device (for VNC)
 -v: Wait for VNC client before booting VM

Submitted by:	Shawn Webb <shawn.webb@hardenedbsd.org>
Approved by:	grehan(mentor),allanjude(original committer)
Relnotes:	yes
Differential Revision:	https://reviews.freebsd.org/D10378