* refactor connection delay injection from client_lb_end2end_test
* fix build
* fix build on older compilers
* clang-format
* buildifier
* a bit of code cleanup
* start failover time whenever the child reports CONNECTING, and don't cancel when deactivating
* clang-format
* rewrite test
* simplify logic in priority policy
* clang-format
* switch to using a bit to indicate child healthiness
* fix reversed comment
* more changes in priority and ring_hash.
priority:
- go back to starting failover timer upon CONNECTING, but only if seen
READY or IDLE more recently than TRANSIENT_FAILURE
ring_hash:
- don't flap back and forth between IDLE and CONNECTING; once we go
CONNECTING, we stay there until either TF or READY
- after the first subchannel goes TF, we proactively start another
subchannel connecting, just like we do after a second subchannel
reports TF, to ensure that we don't stay in CONNECTING indefinitely if
we aren't getting any new picks
- always return ring hash's picker, regardless of connectivity state
- update the subchannel connectivity state seen by the picker upon
subchannel list creation
- start proactive subchannel connection attempt upon subchannel list
creation if needed
* ring_hash: fix connectivity state seen by aggregation and picker
* fix obiwan error
* swap the order of ring_hash aggregation rules 3 and 4
* restore original test
* refactor connection injector QueuedAttempt code
* add test showing that ring_hash will continue connecting without picks
* clang-format
* don't actually need seen_failure_since_ready_ anymore
* fix TSAN problem
* address code review comments
Co-authored-by: Mark D. Roth <roth@google.com>
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