Add solution text for common kvm2 and VirtualBox problems

[tstromberg]

Contains solutions for:

• Hyper-V: VBoxManage.exe: error: VT-x is not available (VERR_VMX_NO_VMX) #1994
• virtualbox: "The host-only adapter we just created is not visible" (needed reboot) #3614
• VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component MachineWrap, interface IMachine #3859
• Unable to start VM: Error getting state for host: machine does not exist #3864
• VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component MachineWrap, interface IMachine #3910
• Unable to start VM: create: precreate: The character device /dev/vboxdrv does not exist #3974
• Unable to start VM: WARNING: The vboxdrv kernel module is not loaded. #4043
• Staring minikube with virtual box on Mojave fails with 0x80004005 #4107
• kvm2: this function is not supported by the connection driver: virNetworkDefineXML #4195

[RA489]

/lgtm

[k8s-ci-robot]

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[k8s-ci-robot]

New changes are detected. LGTM label has been removed.