Merge pull request #2838 from murgatroid99/grpc-js_node_12_fix

grpc-js: Use util.promisify instead of fs/promises for Node 12 compatibility

Merge pull request #2836 from murgatroid99/grpc-js_1.12_1.11_bugfix_m…

…erge

grpc-js: Port bugfixes from 1.11.x into 1.12.x

Merge pull request #2833 from murgatroid99/grpc-js_1.12.0_bump

grpc-js: Bump to 1.12.0

Merge pull request #2833 from murgatroid99/grpc-js_1.12.0_bump

grpc-js: Bump to 1.12.0

Merge pull request #2825 from murgatroid99/grpc-js_round_robin_reresolve

grpc-js: round_robin: Request resolution on connection drop

Merge pull request #2803 from murgatroid99/grpc-js_1.11.2

grpc-js: Bump to 1.11.2

Merge pull request #2800 from murgatroid99/grpc-js_1.11.1

grpc-js: Bump to 1.11.1

Merge pull request #2797 from murgatroid99/grpc-js_1.11.0_real

grpc-js: Bump packages to 1.11.0, and update documentation (actually on 1.11.x this time)

Merge pull request #2797 from murgatroid99/grpc-js_1.11.0_real

grpc-js: Bump packages to 1.11.0, and update documentation (actually on 1.11.x this time)

Merge pull request #2784 from murgatroid99/grpc-js_pick_first_reconne…

…ction_fix

grpc-js: Fix pick_first reconnecting without active calls