segment_rpc: increase log level of payment creation. it's useful!

[iameli]

Increases the log level of payment creation from 6 to 3 - a request from @ecmulli for payment tracking

[ad-astra-video]

I agree! Makes it easy to pick up payments sent on the B from the logs.

[codecov]

Codecov Report

Merging #2843 (8f6b38f) into master (3f62408) will decrease coverage by 0.02213%.
Report is 2 commits behind head on master.
The diff coverage is 20.00000%.

@@                 Coverage Diff                 @@
##              master       #2843         +/-   ##
===================================================
- Coverage   56.72881%   56.70668%   -0.02213%     
===================================================
  Files             88          88                 
  Lines          19149       19160         +11     
===================================================
+ Hits           10863       10865          +2     
- Misses          7690        7699          +9     
  Partials         596         596                 

Files Changed	Coverage Δ
cmd/livepeer/livepeer.go	47.61905% <0.00000%> (ø)
clog/clog.go	59.87261% <15.38462%> (-3.14109%)	⬇️
server/segment_rpc.go	78.23529% <100.00000%> (ø)

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Files Changed	Coverage Δ
cmd/livepeer/livepeer.go	47.61905% <0.00000%> (ø)
clog/clog.go	59.87261% <15.38462%> (-3.14109%)	⬇️
server/segment_rpc.go	78.23529% <100.00000%> (ø)