New Provider: ParsPack

[ahmafi]

Hi, I have created implementation for parspack.ir.
The API reference can be found here.

There is one problem with the tests:

=== RUN   TestParsPackProvider
=== RUN   TestParsPackProvider/ListZones
    libdnstest.go:240: Found 2 zones
    libdnstest.go:248: Zone: shoplee.ir.
    libdnstest.go:248: Zone: testdomain.ir.
=== RUN   TestParsPackProvider/GetRecords
    libdnstest.go:269: Found 2 records in zone testdomain.ir.
    libdnstest.go:278: Record: @ 24h0m0s NS plateau.parspack.net.
    libdnstest.go:278: Record: @ 24h0m0s NS valley.parspack.net.
=== RUN   TestParsPackProvider/AppendRecords
    libdnstest.go:293: Creating test records for append operation
    libdnstest.go:381: Appending 8 new records
    libdnstest.go:390: Appended 8 records successfully
    libdnstest.go:392: Verifying appended records exist in zone
=== RUN   TestParsPackProvider/SetRecords
    libdnstest.go:409: Creating preserved record that should not be affected by SetRecords
    libdnstest.go:422: Created preserved record: test-set-preserve
    libdnstest.go:467: Setting initial records: 6 records of various types
    libdnstest.go:470: SetRecords (initial) failed: Store DNS Record Failed. Message:The record.flags must not be greater than 0.
=== RUN   TestParsPackProvider/DeleteRecords
    libdnstest.go:581: Creating test records for deletion
    libdnstest.go:658: Creating 7 records to be deleted later
    libdnstest.go:663: Created 7 records successfully
    libdnstest.go:665: Deleting the created records
    libdnstest.go:674: Deleted 7 records successfully
    libdnstest.go:676: Verifying records were actually deleted
--- FAIL: TestParsPackProvider (136.29s)
    --- PASS: TestParsPackProvider/ListZones (0.85s)
    --- PASS: TestParsPackProvider/GetRecords (1.95s)
    --- PASS: TestParsPackProvider/AppendRecords (54.19s)
    --- FAIL: TestParsPackProvider/SetRecords (26.50s)
    --- PASS: TestParsPackProvider/DeleteRecords (50.44s)
FAIL
exit status 1
FAIL    github.com/libdns/parspack/libdnstest   136.290s

I think we can set the flags in all the tests to 0 instead of 128, because that would probably have a better support between providers and 128 doesn't add more value (I guess!).

[mholt]

Thank you! I've created repos and added you to them so you can push this. Thanks for maintaining this.