fix(spanner): fix TransactionPingingPool throwing error ''NoneType' object is not callable'#9609

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tseaver merged 6 commits intogoogleapis:masterfrom

larkee:pinging-pool-fix

Nov 11, 2019

Commits on Nov 6, 2019

Commits on Nov 8, 2019

fix static attributes for mock transaction to fix test
larkee
committed

Commits on Nov 11, 2019

Removing accidental redundant file from previous commit
larkee
committed