ENH: Added func __generate_bhyve_vnc_string
ENH: Added func __generate_bhyve_vnc_string

Generates a bhyve command string for VNC console access with the
parameters pulled from the guest’s properties properties.

Tested for string generation on 10.3-REL-p3

Tested to work and execute correctly with bhyve on 11-CURRENT r300097
and r300899.

chyves/chyves