Tests and limit handling for fixed height BIP9 deployment#106

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ajtowns wants to merge 6 commits intosipa:201709_itsalwayssegwitinregtestiafrom

Commits on Oct 13, 2017

[consensus] Pin P2SH activation to block 173805 on mainnet

jnewbery
authored and
sipa
committed
Hardcoded activation height support
sipa
committed
Have SegWit active by default
sipa
committed

Commits on Oct 17, 2017