Introduce a maximum size for locators.

The largest sensible size for a locator is log in the number of blocks.
 But, as noted by Coinr8d on BCT a maximum size message could encode a
 hundred thousand locators.  If height were used to limit the messages
 that could open new attacks where peers on long low diff forks would
 get disconnected and end up stuck.

Ideally, nodes first first learn to limit the size of locators they
 send before limiting what would be processed, but common implementations
 back off with an exponent of 2 and have an implicit limit of 2^32
 blocks, so they already cannot produce locators over some size.

This sets the limit to an absurdly high amount of 101 in order to
 maximize compatibility with existing software.

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