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DAO fork-choice issue

See original GitHub issue

Trinity version: trinity-0.1.0a3
OS: linux
Python Version (python --version): Python 3.6.3

What is wrong?

When doing fullsync with trinity the DAO fork is incorrectly handled and ETC chain followed.

Trinity has been run as follows:

trinity --sync-mode full

Syncronization works:

 trinity attach
 w3.eth.getBlock(5000000)
Out[41]:
AttributeDict({'difficulty': 153555857798073,
 'extraData': HexBytes('0x4554432065746865726d696e65202d20555331'),
 'gasLimit': 4700036,
 'gasUsed': 51416,
 'hash': HexBytes('0xb2f55d12af971452c3669669380e03040ff01fabb64afec6bfddb3052dbd0117'),
 'logsBloom': HexBytes('0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000000000080000000000000000020000000000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000008000000000000000'),
 'mixHash': HexBytes('0x36a33662da9d77511a4580dceb57f46b261247134ffd126398c2fcbff34acae9'),
 'nonce': HexBytes('0x4c85a020172afc4d'),
 'number': 5000000,
 'parentHash': HexBytes('0x001717abe8e5d60afaaa9fd2d62ab9e3a59c711fe7b66b2d9d47162c63d9e9ec'),
 'receiptsRoot': HexBytes('0xcdfeee56af33c91c592567852d74b647801f0355c5160ea42dffbebd25b56d58'),
 'sha3Uncles': HexBytes('0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347'),
 'stateRoot': HexBytes('0x94dbf3aa3242e0039dcb327806652e2c4620eff111a628a2c9488e70d0b10a30'),
 'timestamp': 1513013050,
 'transactionsRoot': HexBytes('0x3063dfd1bda002b2a8737d9ce1d1148f3d178f7a224b92b1419b3c005944c4d7'),
 'miner': '0xDf7D7e053933b5cC24372f878c90E62dADAD5d42',
 'totalDifficulty': 179580593652975622022,
 'uncles': [],
 'size': 763,
 'transactions': [HexBytes('0x9d2f76af534006c0d40e23af572925fba31994597991173f997ba0fc1764af91'),
  HexBytes('0x11c2d6c664d2527ff33e0fc184b946a0d72e86eec03a02134f0162bb8a7dc5b4')]})

This block corresponds to ETC http://etcchain.com/block/number/5000000