add MySQL backend implementant and support all methods#180

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lrita wants to merge 5 commits intodocker:masterfrom lrita:backend-mysql

+1,122-14

Commits on Aug 25, 2017

add MySQL backend implementant and support all methods
lrita
committed

Commits on Aug 31, 2017

make Watch/WatchTree method can watch non-exist key
lrita
committed

Commits on Nov 11, 2019

Add Read/Write-Timeout
lrita
committed

Commits on Nov 12, 2019

ignore mysql.ErrInvalidConn at lock acquring
lrita
committed

Commits on Aug 19, 2020

add rejectReadOnly=true in db's dsn
lrita
committed