Correct failure reason for the duplicate file upload

[Manish-210]

Changes

-Using two channels one for the error message and other for the waitgroup in the chunked upload file to show correct error message to the user.

Fixes

-0chain/zboxcli#327

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):

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

[service-0chain]

Manual system tests [failure] with the following config

config	value
tests skipped	FALSE
system-tests	correct_upload_failure_reason
gosdk	correct_failure_reason
zboxcli	staging
zwalletcli	staging
0chain	staging
blobber	staging
authorizer	staging
0box	staging
0block	staging
0dns	staging
explorer	staging
0proxy	staging
0search	staging

[peterlimg]

LGTM

[service-0chain]

Manual system tests [success] with the following config

config	value
tests skipped	FALSE
system-tests	correct_upload_failure_reason
gosdk	correct_failure_reason
zboxcli	staging
zwalletcli	staging
0chain	staging
blobber	staging
authorizer	staging
0box	staging
0block	staging
0dns	staging
explorer	staging
0proxy	staging
0search	staging