Suppress unimplemented MSR related warnings

[brendabrandy]

While using bhyve on intel machines, if certain MSRs are unimplemented, the bhyve console is spammed with these messages:

rdmsr to register 0x684 on vcpu 1
rdmsr to register 0x6c4 on vcpu 1
rdmsr to register 0x683 on vcpu 1
rdmsr to register 0x6c3 on vcpu 1
rdmsr to register 0x682 on vcpu 1
rdmsr to register 0x6c2 on vcpu 1
rdmsr to register 0x681 on vcpu 1
rdmsr to register 0x6c1 on vcpu 1
rdmsr to register 0x680 on vcpu 1
rdmsr to register 0x6c0 on vcpu 1
Password:
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login:
login:
login:
login: rdmsr to register 0x1c9 on vcpu 0
rdmsr to register 0x1dd on vcpu 0
rdmsr to register 0x1de on vcpu 0
rdmsr to register 0x68f on vcpu 0
rdmsr to register 0x6cf on vcpu 0
rdmsr to register 0x68e on vcpu 0
rdmsr to register 0x6ce on vcpu 0
rdmsr to register 0x68d on vcpu 0
rdmsr to register 0x6cd on vcpu 0
rdmsr to register 0x68c on vcpu 0
rdmsr to register 0x6cc on vcpu 0
rdmsr to register 0x68b on vcpu 0
rdmsr to register 0x6cb on vcpu 0
rdmsr to register 0x68a on vcpu 0
rdmsr to register 0x6ca on vcpu 0
rdmsr to register 0x689 on vcpu 0
rdmsr to register 0x6c9 on vcpu 0
rdmsr to register 0x688 on vcpu 0
rdmsr to register 0x6c8 on vcpu 0
rdmsr to register 0x687 on vcpu 0
rdmsr to register 0x6c7 on vcpu 0
rdmsr to register 0x686 on vcpu 0

This does not interfere with the normal operation of bhyve (since I can run the image), and there are already options to ignore unimplmented MSRs and continue (-w) But the warning messages makes it difficult to use the console. A new option -q is created to suppress the rdmsr and wrmsr messages.