Find clean way to edit resolv.conf if it was replaced/bind mounted about pimod HOT 3 CLOSED

For me, those are two issues of their own, which can be addressed like the following.

First, introduce a second pimod flag to do the opposite of --host-resolv, never bind the host's /etc/resolv.conf to the client. This, however, might lead to errors due to the file's absence.
Nevertheless, if a modification to the /etc/resolv.conf file is made first, this should work, since the user is aware of this with the explicit flag.

Second, we could introduce such an environmental variable, as you have already suggested in #55.
Otherwise, as this is very specific to your use case, you could use the ENV command within your Pifile.

Please let me know if this would work for you.

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Thinking about it, I guess you're right! thanks fpr the suggestion. This will work for me...

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@sensslen: I just refactored the --host-resolv flag into a more generic --resolv flag, allowing the user to select between the prior auto behavior, always using the guest's resolv.conf (never mount), or always using the host's resolv.conf (introduced as --host-resolv before).

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