Fix pytest tests

[zeromind]

There are quite a few pytest tests failing, we should fix the code/tests.

10 failed, 184 passed, 332 warnings in 112.17s (0:01:52)

• tests/allocator_test.py AllocatorTest::test_delegation_not_subnetFAILED #205

  FAILED tests/allocator_test.py::AllocatorTest::test_delegation_not_subnet - sqlalchemy.exc.IntegrityError: (MySQLdb._exceptions.IntegrityError) (1062, "Duplicate entry '83076749736557242056487941267521536-64-384' for key 'address'")

• tests/commands_test.py
  CommandsTest::test_pool_report

  FAILED tests/commands_test.py::CommandsTest::test_pool_report - AssertionError: assert '444 IPs are still free' in 'Pool pool\ndays 1 7 30\nusage 24 ... 64\n444.0 IPs are still free\nBased on data from the last 30 days, the pool will be full in 208.1 days.\n'

  The called function does division and returns a float of number of IPs, but there can't be fractions of IPs, code should be adjusted to return int.

• tests/commands_test.py CommandsTest::test_pool_reportv6

  FAILED tests/commands_test.py::CommandsTest::test_pool_reportv6 - AssertionError: assert '448 /64 blocks are still free' in 'Pool pool\ndays 1 7 30\nusage 20 ... 60\n448.0 /64 blocks are still free\nBased on data from the last 30 days, the pool will be full in 224.0 days.\n'

  The called function does division and returns a float of number of IPs, but there can't be fractions of IPs, code should be adjusted to return int.

• tests/dns_test.py test_validate_strings

  FAILED tests/dns_test.py::test_validate_strings - ValueError: Invalid escape sequence: \223

  Related to unicode in TXT records #72 and remove dependency on six #176

• tests/dns_test.py ZoneTest::test_subzone

  FAILED tests/dns_test.py::ZoneTest::test_subzone - dim.errors.InvalidZoneError: Zone company.com does not exist`

  Test creates the parent zone with wrong name.

• tests/dns_test.py TXT::test_parse

  FAILED tests/dns_test.py::TXT::test_parse - dim.errors.InvalidParameterError: Invalid escape sequence: \100`

  Related to unicode in TXT records #72 and remove dependency on six #176

• tests/dns_test.py RRReferencesTest::test_edit_comment_ttl

  FAILED tests/dns_test.py::RRReferencesTest::test_edit_comment_ttl - AssertionError: assert {'graph': {1:...}], 'root': 2} == {'graph': {1:...}], 'root': 2}`

• tests/dns_test.py RRReferencesTest::test_get_references

  FAILED tests/dns_test.py::RRReferencesTest::test_get_references - AssertionError: assert {'graph': {1:...}], 'root': 2} == {'graph': {1:...}], 'root': 2}`

• tests/dnssec_test.py test_ds_hash

  FAILED tests/dnssec_test.py::DNSKEYTest::test_ds_hash - TypeError: owner must be of type bytes, got <class 'str'>`

  The called function expects bytes for owner, but the test sets str; adjust to .encode('utf-8').

• tests/pool_test.py PoolTest::test_priority

  FAILED tests/pool_test.py::PoolTest::test_priority - TypeError: unsupported operand type(s) for +=: 'NoneType' and 'str'`