Update writemarker lock function

[lpoli]

Changes

• Allow client to refresh existing lock

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: Fix/concurrent operation issue gosdk#741
• system_test:
• zboxcli: Fix concurrent operation issue zboxcli#347
• zwalletcli:
• Other: ...

[codecov-commenter]

Codecov Report

Merging #931 (0299d8c) into staging (a264988) will decrease coverage by 0.10%.
The diff coverage is 75.00%.

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@@             Coverage Diff             @@
##           staging     #931      +/-   ##
===========================================
- Coverage    26.63%   26.53%   -0.10%     
===========================================
  Files           76       76              
  Lines         7648     7638      -10     
===========================================
- Hits          2037     2027      -10     
  Misses        5345     5345              
  Partials       266      266              

Flag	Coverage Δ
Unit-Tests	26.53% <75.00%> (-0.10%)	⬇️

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

Impacted Files	Coverage Δ
...ode/go/0chain.net/blobbercore/writemarker/mutex.go	57.97% <75.00%> (-5.33%)	⬇️

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[service-0chain]

Manual system tests [failure] with the following config

config	value
tests skipped	FALSE
system-tests	master
gosdk	fix/concurrent-operation-issue
zboxcli	staging
zwalletcli	staging
0chain	staging
blobber	fix/concurrent-operation-issue
authorizer	staging
0box	staging
0block	staging
0dns	staging
explorer	staging
0proxy	staging
0search	staging

[service-0chain]

Manual system tests [success] with the following config

config	value
tests skipped	FALSE
system-tests	master
gosdk	fix/concurrent-operation-issue
zboxcli	staging
zwalletcli	staging
0chain	staging
blobber	fix/concurrent-operation-issue
authorizer	staging
0box	staging
0block	staging
0dns	staging
explorer	staging
0proxy	staging
0search	staging

[dabasov]

lgtm

[peterlimg]

Mark system tests as pass as changes are not related to the errors.

[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	fix/concurrent-operation-issue
authorizer	staging
0box	staging
0block	staging
0dns	staging
explorer	master
0proxy	staging
0search	staging