also populate the foreignkey field

[boddumanohar]

Changes

• when getting fileStats, also populate foreignKey fields

Fixes

Tests

Tasks to complete before merging PR:

• Ensure system tests are passing. If not Run them manually to check for any regressions 📋
• Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• 0chain:
• gosdk:
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...

[codecov-commenter]

Codecov Report

Merging #952 (39324f1) into staging (eafe682) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff            @@
##           staging     #952   +/-   ##
========================================
  Coverage    26.45%   26.45%           
========================================
  Files           76       76           
  Lines         7663     7663           
========================================
  Hits          2027     2027           
  Misses        5370     5370           
  Partials       266      266           

Flag	Coverage Δ
Unit-Tests	26.45% <ø> (ø)

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[peterlimg]

LGTM

[service-0chain]

Manual system tests [success] with the following config

config	value
tests skipped	TRUE
system-tests	master
gosdk	NOT OVERRIDDEN
zboxcli	staging
zwalletcli	staging
0chain	staging
blobber	file-stats
authorizer	staging
0box	staging
0block	staging
0dns	staging
explorer	master
0proxy	staging
0search	staging

fixed