remove GetObjectPath API

[boddumanohar]

Changes

The GetObjectPath is not used anywhere and this can be removed
#859 (comment)

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 #863 (9470129) into staging (cdfe378) will decrease coverage by 0.17%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           staging     #863      +/-   ##
===========================================
- Coverage    25.72%   25.55%   -0.18%     
===========================================
  Files           72       72              
  Lines         7906     7831      -75     
===========================================
- Hits          2034     2001      -33     
+ Misses        5601     5567      -34     
+ Partials       271      263       -8     

Flag	Coverage Δ
Unit-Tests	25.55% <ø> (-0.18%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../go/0chain.net/blobbercore/handler/grpc_handler.go	8.63% <ø> (+0.89%)	⬆️
code/go/0chain.net/blobbercore/handler/handler.go	64.47% <ø> (-0.81%)	⬇️
.../0chain.net/blobbercore/handler/storage_handler.go	22.55% <ø> (-1.24%)	⬇️

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[cnlangzi]

LGTM

[peterlimg]

LGTM