Use FillBytes in Provisioners.MemberAt

[goshawk-3]

fixes #1457

[codecov-commenter]

Codecov Report

Merging #1458 (5929476) into master (57c6bbd) will increase coverage by 0.15%. The diff coverage is 57.14%.

@@            Coverage Diff             @@
##           master    #1458      +/-   ##
==========================================
+ Coverage   40.18%   40.33%   +0.15%     
==========================================
  Files         147      147              
  Lines        9651     9646       -5     
==========================================
+ Hits         3878     3891      +13     
+ Misses       5144     5128      -16     
+ Partials      629      627       -2     

Impacted Files	Coverage Δ
pkg/util/nativeutils/sortedset/sortedset.go	48.14% <0.00%> (-0.45%)	:arrow_down:
pkg/core/consensus/user/provisioners.go	47.05% <66.66%> (ø)
pkg/rpc/client/session.go	21.42% <0.00%> (-4.77%)	:arrow_down:
pkg/core/data/base58/base58.go	72.82% <0.00%> (-1.09%)	:arrow_down:
...nsensus/blockgenerator/candidate/blockgenerator.go	0.00% <0.00%> (ø)
pkg/core/loop/consensus.go	82.79% <0.00%> (+2.15%)	:arrow_up:
pkg/gql/notifications/broker.go	77.63% <0.00%> (+14.47%)	:arrow_up:
pkg/gql/notifications/client.go	51.72% <0.00%> (+17.24%)	:arrow_up:

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