Decrease the delay between Hyper-V VM startup and hyper-v builder's ability to send keystrokes to the target VM.

[williamb1024]

The Hyper-V ISO builder attempts to determine the host's IP address after starting the target VM, waiting for the boot_wait value to expire, and before sending boot_command keystrokes. Because the amount of time to determine the host's IP address can vary the actual wait time before sending boot_command keystrokes is indeterminate.

This commit moves the HostIp determination before the target VM is started, so that the boot_command keystrokes wait can be controlled in a more accurate manner.

This commit also modifies the steps to connect to the VM (in non-headless mode) before the VM is started in an attempt to further ensure the boot wait timeout is not unintentionally extended.

May close: #7278

[williamb1024]

Verified with Windows Server 2016 installation that these changes do allow the boot command to generate key presses quickly enough that the "Press any key to boot from CD prompt" can be acknowledged. #7278

[SwampDragons]

Needed to rebase on master in order to get the make-generate-check passing.

[ghost]

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