Explicitly initialize Common instances with chainstart HF

[holgerd77]

Fixes ethereumjs/ethereumjs-monorepo#757

This was triggered (repeatedly) during block synchronization:

INFO [05-28|17:50:53] Imported blocks count=256 number=45441 hash=97e6df8e... peers=2
INFO [05-28|17:50:53] Imported blocks count=128 number=45697 hash=cec4ec8f... peers=2
INFO [05-28|17:50:54] Imported blocks count=128 number=45825 hash=b48ff3a6... peers=2
INFO [05-28|17:50:54] Imported blocks count=128 number=45953 hash=09765b76... peers=2
ERROR [05-28|17:50:55] Error: Method called with neither a hardfork set nor provided by param
    at Common._chooseHardfork (/ethereumjs-client/node_modules/ethereumjs-common/dist/index.js:114:23)
    at Common.hardforkGteHardfork (/ethereumjs-client/node_modules/ethereumjs-common/dist/index.js:228:26)
    at Common.gteHardfork (/ethereumjs-client/node_modules/ethereumjs-common/dist/index.js:255:21)
    at Transaction._validateV (/ethereumjs-client/node_modules/ethereumjs-tx/dist/transaction.js:301:27)
    at new Transaction (/ethereumjs-client/node_modules/ethereumjs-tx/dist/transaction.js:138:14)
    at new module.exports (/ethereumjs-client/node_modules/ethereumjs-block/index.js:75:14)
    at /ethereumjs-client/lib/blockchain/chain.js:208:30
    at Array.map (<anonymous>)
    at Chain.putBlocks (/ethereumjs-client/lib/blockchain/chain.js:208:21)
    at BlockFetcher.store (/ethereumjs-client/lib/sync/fetcher/blockfetcher.js:89:22)

[coveralls]

Coverage remained the same at 92.672% when pulling 08f212c on fix-undefined-transaction-state-on-block-addition into 22a72f4 on master.

[holgerd77]

Will make an exception here and do an admin merge, since this is currently blocking further work on the library and I think in this get-things-going period this should hopefully be acceptable, will eventually also do on selected other PRs during the week. Better to have a review though of course.

[evertonfraga]

Consider it late-reviewed 😉