[vm] disable unattended upgrades on debian/ubuntu on EC2

[pducolin]

What does this PR do?

Disable apt unattended upgrades at startup through userdata

Which scenarios this will impact?

aws debian and ubuntu

Motivation

ADXT-686

Additional Notes

[KevinFairise2]

Does it really work if vmArgs.userData already contains something?
I feel like we could end with a script that looks like:

#!/bin/bash
echo "First userdata"
#!/bin/bash
apt-get -y remove unattended-upgrades

And I am not sure it would work

[pducolin]

TIL #! is called shebang. A script starting with shebang that is used as if it was an executable will use the interpreter defined after the shebang to interpret commands.

Following shebang are discarded as comments.

Tried running the following on zsh

#!/bin/bash
echo "First userdata"
#!/bin/bash
echo "something else"

And I get

First userdata
something else

[KevinFairise2]

I see! As long as we provide user data with same language it should work. If we start to pass bash script and python script it will break but that is unlikely we do that

[KevinFairise2]

We could also enforce bash scripting and automatically set the shebang to bash.

[pducolin]

/merge

[dd-devflow]

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