Segment reset API

[npawar]

Adding a reset API. This API will disable and then enable the segment. This API will be useful in case of resetting consumers which are stuck as reported in #6308.
NOTE: Manual testing done. Writing tests pending.

1. If the segment is in ERROR state, invoking this API will send state transitions first to OFFLINE, wait for EV to stabilize, and then back to ONLINE/CONSUMING.
2. If segment is ONLINE/CONSUMING, invoking this API will send state transitions, first to OFFLINE, wait for EV to stabilize, and then back to ONLINE/CONSUMING.

Reset one segment:

 curl -X POST "http://localhost:9000/segments/transcript_REALTIME/transcript__1__3__20201208T1956Z/reset" -H "accept: application/json"
{"status":"Successfully reset segment: transcript__1__3__20201208T1956Z of table: transcript_REALTIME"}

Reset all segments:

curl -X POST "http://localhost:9000/segments/transcript_REALTIME/reset" -H "accept: application/json" 
{"status":"Successfully reset all segments of table: transcript_REALTIME"}

[codecov-io]

Codecov Report

Merging #6336 (415a6c7) into master (1beaab5) will increase coverage by 6.89%.
The diff coverage is 73.16%.

@@            Coverage Diff             @@
##           master    #6336      +/-   ##
==========================================
+ Coverage   66.44%   73.34%   +6.89%     
==========================================
  Files        1075     1318     +243     
  Lines       54773    64104    +9331     
  Branches     8168     9329    +1161     
==========================================
+ Hits        36396    47019   +10623     
+ Misses      15700    14032    -1668     
- Partials     2677     3053     +376     

Flag	Coverage Δ
integration	44.28% <38.69%> (?)
unittests	64.99% <56.80%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ot/broker/broker/AllowAllAccessControlFactory.java	100.00% <ø> (ø)
.../helix/BrokerUserDefinedMessageHandlerFactory.java	52.83% <0.00%> (-13.84%)	⬇️
...ker/routing/instanceselector/InstanceSelector.java	100.00% <ø> (ø)
.../main/java/org/apache/pinot/client/Connection.java	44.44% <0.00%> (-4.40%)	⬇️
...not/common/assignment/InstancePartitionsUtils.java	78.57% <ø> (+5.40%)	⬆️
...common/config/tuner/NoOpTableTableConfigTuner.java	100.00% <ø> (ø)
...ot/common/config/tuner/RealTimeAutoIndexTuner.java	100.00% <ø> (ø)
.../common/config/tuner/TableConfigTunerRegistry.java	72.00% <ø> (ø)
.../apache/pinot/common/exception/QueryException.java	90.27% <ø> (+5.55%)	⬆️
...pinot/common/function/AggregationFunctionType.java	100.00% <ø> (ø)
... and 1122 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b8bc74f...415a6c7. Read the comment docs.

[kishoreg]

Minor comments