limit max objects in a directory

[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: 21 lines in your changes are missing coverage. Please review.

Comparison is base (30ef036) 23.63% compared to head (2bbd9e6) 23.60%.

Files	Patch %	Lines
...o/0chain.net/blobbercore/handler/handler_common.go	0.00%	9 Missing :warning:
...chain.net/blobbercore/allocation/copyfilechange.go	0.00%	3 Missing and 1 partial :warning:
....net/blobbercore/allocation/file_changer_upload.go	0.00%	4 Missing :warning:
...chain.net/blobbercore/allocation/movefilechange.go	0.00%	3 Missing and 1 partial :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## sprint-1.12 #1364 +/- ## =============================================== - Coverage 23.63% 23.60% -0.04% =============================================== Files 87 87 Lines 10098 10111 +13 =============================================== Hits 2387 2387 - Misses 7415 7426 +11 - Partials 296 298 +2 ``` | [Flag](https://app.codecov.io/gh/0chain/blobber/pull/1364/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/1364/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=0chain) | `23.60% <0.00%> (-0.04%)` | :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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