Merge pull request grpc#14545 from mehrdada/final-1-10-0

Bump version to 1.10.x   #glamorous

Merge pull request grpc#14526 from mehrdada/bump-1-10-0-pre2

 Bump version to 1.10.0-pre2

Fix submodule handling in dockerized tests

Merge pull request grpc#14327 from kpayson64/bump_1_9_1

Bump version to 1.9.1

Merge pull request grpc#14265 from mehrdada/releasetag

Promote v1.9.0-pre3 to v1.9.0

Merge pull request grpc#14205 from mehrdada/one-point-nine-arr-see-th…

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Bump version to 1.9.0-pre3

Merge pull request grpc#14206 from kpayson64/bump_version_186

Bump to 1.8.6

Merge pull request grpc#14114 from jtattermusch/bump_190_pre2

 1.9.0-pre1 is now 1.9.0-pre2

Merge pull request grpc#14091 from mehrdada/v1.9.x

Bump v1.9.x to 1.9.x-pre1

Merge pull request grpc#14053 from stanley-cheung/v1.8.5_bump

Bump to 1.8.5