only kubelet cached in the VHD can be picked for a specific version

[mainred]

When building the VHD, we extract the kubelet binary to /usr/local/bin/ according to install-dependencies.sh, so that when we use CSE to install the exact kubelet from the user-input URL, like a hotfix, the hotfix will be skipped for the existing kubelet binary with the same kubernetes version, achieved by cse_install.sh. This brings less flexibility because only the cached kubelet can be used regardless of the user input, and we have to build a VHD in order to include the hotfixed kubelet.

[alexeldeib]

@mainred I'd welcome a PR to simply include the full url in file. this would have big benefits Kubelet hotfixes for aks generally.

[cameronmeissner]

closing due to age and inactivity, feel free to re-open if necessary.