fsmonitor: start using an opaque token for last update#510

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kewillford wants to merge 4 commits intogitgitgadget:masterfrom

kewillford:fsmonitor_opaque_token

Commits on Jan 2, 2020

fsmonitor: change last update timestamp on the index_state to opaque token
kewillford
committed

Commits on Jan 6, 2020

fsmonitor: handle version 2 of the hooks that will use opaque token
kewillford
committed

Commits on Jan 23, 2020

fsmonitor: add fsmonitor hook scripts for version 2
kewillford
committed
fsmonitor: update documentation for hook version and watchman hooks
kewillford
committed