Connections for batch upload

[Hitenjain14]

Changes

Fixes

Tests

Tasks to complete before merging PR:

• [ ] Ensure system tests are passing. If not Run them manually to check for any regressions :clipboard:
• [ ] 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

Attention: Patch coverage is 25.00000% with 21 lines in your changes are missing coverage. Please review.

Project coverage is 14.89%. Comparing base (7ce03e2) to head (0044645). Report is 135 commits behind head on staging.

Files	Patch %	Lines
...de/go/0chain.net/blobbercore/datastore/postgres.go	33.33%	7 Missing and 1 partial :warning:
...go/0chain.net/blobbercore/allocation/connection.go	0.00%	7 Missing :warning:
...et/blobbercore/handler/object_operation_handler.go	25.00%	3 Missing :warning:
...ain.net/blobbercore/handler/file_command_update.go	0.00%	2 Missing :warning:
...ain.net/blobbercore/handler/file_command_delete.go	0.00%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## staging #1433 +/- ## =========================================== - Coverage 15.01% 14.89% -0.13% =========================================== Files 178 179 +1 Lines 19908 20178 +270 =========================================== + Hits 2989 3005 +16 - Misses 16548 16800 +252 - Partials 371 373 +2 ``` | [Flag](https://app.codecov.io/gh/0chain/blobber/pull/1433/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=0chain) | Coverage Δ | | |---|---|---| | [Unit-Tests](https://app.codecov.io/gh/0chain/blobber/pull/1433/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=0chain) | `14.89% <25.00%> (-0.13%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=0chain#carryforward-flags-in-the-pull-request-comment) to find out more.

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