Require Hyper-V to start waagent service

[vittyvk]

Description

WALinuxAgent is Azure specific and Azure runs on Hyper-V. Add

ConditionVirtualization=microsoft

to service files to avoid starting WALA in other environments. In particular, this avoids polluting the console when the
same image is used both for Azure and some other env (e.g. local QEMU).

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[narrieta]

@anhvoms - could you take a look?

[jeremycline]

For what it's worth, this looks good to me and helps reduce the patches distributions have to carry. There's a slight deviation from Fedora's downstream patch by Chris, but I think it's okay unless he has strong feelings about it being a triggering conditional.

[jeremycline]

This looks fine to me, although it does differ from the patch we're carrying in Fedora in that it's not a triggering conditional.

@cjp256 do you still feel that it should be a triggering conditional? In my opinion, it's just as easy to systemctl --edit --full waagent.service as it is to drop in an additional triggering conditional, but I've not thought hard about it.