simulator: Update for recent kvs API changes

[chu11]

Add flags argument to kvs_commit() calls to work with new KVS API.

To be merged after flux-core PR #982 is merged.

[garlick]

I just merged flux-framework/flux-core#982 and restarted travis on this PR.

[coveralls]

Coverage remained the same at 72.679% when pulling 682734f on chu11:kvsabichange into 8f43078 on flux-framework:master.

[codecov-io]

Codecov Report

Merging #234 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #234      +/-   ##
==========================================
+ Coverage      55%   55.05%   +0.05%     
==========================================
  Files          25       25              
  Lines        5178     5184       +6     
  Branches     1167     1168       +1     
==========================================
+ Hits         2848     2854       +6     
  Misses       1626     1626              
  Partials      704      704

Impacted Files	Coverage Δ
simulator/simulator.c	62.5% <ø> (ø)	✅
simulator/sim_execsrv.c	65.3% <100%> (ø)	✅
src/common/libutil/shortjansson.h	65.15% <ø> (+3.48%)	✅

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[dongahn]

LGTM. Merging.