Increase Cell Ts pairs to 1024

[hsaraogi]

Goals (and why): After the sweep rewrite we can sweep faster without causing C* OOMs.

Implementation Description (bullets): bump the config value

Concerns (what feedback would you like?): Should we test on internal fruity deployment before rolling out widely? can this be 100k?

Where should we start reviewing?: one file

Priority (whenever / two weeks / yesterday): soon

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This change is 

[gsheasby]

This is a little on the conservative side, but should be ok to start. We should test higher values (100k? 1 million?) on individual deployments that don't have strict uptime requirements. If that goes smoothly, we can bump the hint again.

[codecov-io]

Codecov Report

Merging #2507 into develop will decrease coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             develop   #2507      +/-   ##
============================================
- Coverage      60.15%   60.1%   -0.06%     
+ Complexity      4649    3385    -1264     
============================================
  Files            859     859              
  Lines          40030   40030              
  Branches        4076    4076              
============================================
- Hits           24081   24059      -22     
- Misses         14481   14504      +23     
+ Partials        1468    1467       -1

Impacted Files	Coverage Δ	Complexity Δ
...in/java/com/palantir/atlasdb/AtlasDbConstants.java	90.47% <ø> (ø)	1 <0> (ø)	⬇️
...ain/java/com/palantir/paxos/PaxosQuorumStatus.java	77.77% <0%> (-11.12%)	0% <0%> (ø)
...ain/java/com/palantir/leader/LeadershipEvents.java	83.33% <0%> (-8.34%)	0% <0%> (ø)
...lasdb/keyvalue/impl/SweepStatsKeyValueService.java	72.41% <0%> (-6.04%)	19% <0%> (-1%)
...ain/java/com/palantir/paxos/PaxosAcceptorImpl.java	73.21% <0%> (-5.36%)	0% <0%> (ø)
.../palantir/atlasdb/sweep/BackgroundSweeperImpl.java	77.22% <0%> (-2.98%)	0% <0%> (-16%)
...main/java/com/palantir/paxos/PaxosLearnerImpl.java	87.8% <0%> (-2.44%)	0% <0%> (ø)
...om/palantir/leader/PaxosLeaderElectionService.java	79.44% <0%> (-1.12%)	0% <0%> (ø)
...tion/impl/AbstractSerializableTransactionTest.java	85.2% <0%> (-1.1%)	34% <0%> (ø)
...n/java/com/palantir/lock/impl/LockServiceImpl.java	83.3% <0%> (+0.35%)	91% <0%> (ø)	⬇️

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