Features/lock

[themanforfree]

Please briefly answer these questions:

• what problem are you trying to solve? (or if there's no problem, what's the motivation for this change?)
  Support lock service
• what changes does this pull request make?
  Support lock service
• are there any non-obvious implications of these changes? (does it break compatibility with previous versions, etc)
  No

[codecov]

Codecov Report

Merging #153 (bab31e1) into master (1a15496) will increase coverage by 6.29%.
The diff coverage is 81.06%.

@@            Coverage Diff             @@
##           master     #153      +/-   ##
==========================================
+ Coverage   64.07%   70.37%   +6.29%     
==========================================
  Files          61       61              
  Lines       10452    10638     +186     
==========================================
+ Hits         6697     7486     +789     
+ Misses       3755     3152     -603     

Impacted Files	Coverage Δ
xline/src/rpc/mod.rs	73.39% <ø> (+9.17%)	⬆️
xline/src/server/kv_server.rs	62.08% <0.00%> (ø)
xline/src/storage/auth_store/perms.rs	87.75% <0.00%> (-12.25%)	⬇️
xline/src/storage/auth_store/store.rs	77.06% <28.94%> (+0.85%)	⬆️
xline/src/client/mod.rs	61.70% <44.44%> (+9.70%)	⬆️
xline/src/state.rs	86.86% <89.74%> (+1.86%)	⬆️
xline/src/server/lock_server.rs	93.49% <92.72%> (+87.75%)	⬆️
xline/src/server/lease_server.rs	70.00% <100.00%> (+59.95%)	⬆️
xline/src/server/watch_server.rs	68.72% <100.00%> (+11.51%)	⬆️
xline/src/server/xline_server.rs	86.16% <100.00%> (+0.08%)	⬆️
... and 23 more

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