Enable restoring Teleporter archives from the command line

[iain-henderson]

…d line

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What does this PR aim to accomplish?:

In combination with updates to AdminLTE this PR enhances pihole so that it can restore a teleporter archive from the command line.

How does this PR accomplish the above?:

The addition of an argument to the teleporter arguments (i.e. pihole -a -t -r myname.tar.gz). This addition includes some additional argument parsing and help text.

Link documentation PRs if any are needed to support this PR:

pi-hole/docs#818

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Re-review requested

[dschaper]

@rdwebdesign In case you missed this.

[yubiuser]

The change in basic-install.sh does not belong in your PR. Please rebase on latest developmentans squash all your commits down.

[hubertbanas]

Thank you for this PR! I see potential for multi Pi-hole sync implementation for high availability.

When can we expect this PR to be merged?

[iain-henderson]

My understanding is that these changes mirror an implementation in the next major release of Pi-Hole (but that could be a misunderstanding).