SCB-128 Optimize lease.go

[little-cui]

No description provided.

[coveralls]

Coverage remained the same at 72.395% when pulling 1ff9f05 on little-cui:master into 5a55d25 on apache:master.

[codecov-io]

Codecov Report

Merging #231 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #231   +/-   ##
======================================
  Coverage    68.7%   68.7%           
======================================
  Files          17      17           
  Lines        3560    3560           
======================================
  Hits         2446    2446           
  Misses        937     937           
  Partials      177     177

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