throw non zero exit status on failure of copy and move command

[boddumanohar]

A brief description of the changes in this PR:

fixes https://github.com/0chain/zboxcli/issues/251

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:
• blobber:
• gosdk:
• system_test:
• zwalletcli:
• Other: ...

[boddumanohar]

@cnlangzi updated the PR as per comments. PTAL

[cnlangzi]

@cnlangzi updated the PR as per comments. PTAL

os.Exit(1) can be removed , because panic will throw 1 now

[cnlangzi]

@boddumanohar please also fix related system_tests, thanks.

[service-0chain]

Manual system tests [failure] with the following config

config	value
tests skipped	FALSE
system-tests	file-copy
gosdk	staging
zboxcli	251
zwalletcli	staging
0chain	staging
blobber	staging
authorizer	staging
0box	staging
0block	staging
0dns	staging
explorer	staging
0proxy	staging
0search	staging

[service-0chain]

Manual system tests [cancelled] with the following config

config	value
tests skipped	FALSE
system-tests	file-copy
gosdk	staging
zboxcli	251
zwalletcli	staging
0chain	staging
blobber	staging
authorizer	staging
0box	staging
0block	staging
0dns	staging
explorer	staging
0proxy	staging
0search	staging

[service-0chain]

Manual system tests [failure] with the following config

config	value
tests skipped	FALSE
system-tests	master
gosdk	staging
zboxcli	251
zwalletcli	staging
0chain	staging
blobber	staging
authorizer	staging
0box	staging
0block	staging
0dns	staging
explorer	staging
0proxy	staging
0search	staging

[peterlimg]

@boddumanohar please fix the system tests https://github.com/0chain/system_test/tree/file-copy.

[service-0chain]

Manual system tests [failure] with the following config

config	value
tests skipped	FALSE
system-tests	file-copy
gosdk	staging
zboxcli	251
zwalletcli	staging
0chain	staging
blobber	staging
authorizer	staging
0box	staging
0dns	staging

[service-0chain]

Manual system tests [success] with the following config

config	value
tests skipped	TRUE
system-tests	file-copy
gosdk	staging
zboxcli	251
zwalletcli	staging
0chain	staging
blobber	staging
authorizer	staging
0box	staging
0dns	staging

[service-0chain]

Manual system tests [success] with the following config

config	value
tests skipped	TRUE
system-tests	file-copy
gosdk	staging
zboxcli	staging
zwalletcli	staging
0chain	staging
blobber	staging
authorizer	staging
0box	staging
0dns	staging