Support both for onPremise and onPrem within interal binaries

[khanhntd]

Close #474

Description of the issue

Support both onPrem and onPremise for config translator due to breaking changes

License

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Tests

For testing, building binaries from external repo and implement the changes:

• On Mac (with CTL) - CTL only supports on Premise

sudo ./amazon-cloudwatch-agent-ctl -a fetch-config -m onPremise -s -c file:./config.json

Got Home directory: /var/root
I! Set home dir Linux: /var/root
I! SDKRegionWithCredsMap region:  us-west-2
Successfully fetched the config and saved in /opt/aws/amazon-cloudwatch-agent/etc/amazon-cloudwatch-agent.d/file_config.json.tmp
2022/08/02 14:15:18 Reading json config file path: /opt/aws/amazon-cloudwatch-agent/etc/amazon-cloudwatch-agent.d/file_config.json.tmp ...
2022/08/02 14:15:18 I! Valid Json input schema.

• On Mac (with Translator) - OnPrem

khanhntd@88665a0eaf54 amazon-cloudwatch-agent-pre-pkg % ./config-translator --input ./config.json --mode onPrem   
2022/08/02 14:05:54 Reading json config file path: ./config.json ...
Cannot access : lstat : no such file or directory 
2022/08/02 14:05:54 unable to scan config dir  with error: lstat : no such file or directory
2022/08/02 14:05:54 I! Valid Json input schema.

• On Mac (with Translator) - OnPremise

khanhntd@88665a0eaf54 amazon-cloudwatch-agent-pre-pkg % ./config-translator --input ./config.json --mode onPremise
2022/08/02 14:06:03 Reading json config file path: ./config.json ...
Cannot access : lstat : no such file or directory 
2022/08/02 14:06:03 unable to scan config dir  with error: lstat : no such file or directory
2022/08/02 14:06:03 I! Valid Json input schema.

• On Mac (with Translator) - Unexpected mode

khanhntd@88665a0eaf54 amazon-cloudwatch-agent-pre-pkg % ./config-translator --input ./config.json --mode onPremi
2022/08/02 14:05:58 Invalid mode onPremi. Valid mode values are ec2, onPrem and onPremise.
panic: Invalid mode onPremi. Valid mode values are ec2, onPrem and onPremise.

goroutine 1 [running]:
log.Panicf({0x162887b?, 0x7?}, {0xc00019fd50?, 0xc0003443c0?, 0x0?})

• On Linux (similar test case to Mac)

Requirements

Before commit the code, please do the following steps.

1. Run make fmt and make fmt-sh
2. Run make linter

[codecov-commenter]

Codecov Report

Merging #532 (9aa2859) into master (a809746) will decrease coverage by 0.26%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #532      +/-   ##
==========================================
- Coverage   57.03%   56.77%   -0.27%     
==========================================
  Files         373      374       +1     
  Lines       17665    17760      +95     
==========================================
+ Hits        10076    10083       +7     
- Misses       6999     7085      +86     
- Partials      590      592       +2     

Impacted Files	Coverage Δ
cmd/config-translator/translator.go	0.00% <0.00%> (ø)
plugins/outputs/cloudwatch/cloudwatch.go	75.27% <0.00%> (-0.66%)	⬇️
translator/cmdutil/userutil_darwin.go	10.52% <0.00%> (ø)

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[sethAmazon]

Is this a visual bug?

[khanhntd]

I fixed that in old commit and its not shown for me with newest commit https://github.com/aws/amazon-cloudwatch-agent/pull/532/files. So yes might be a visual bug

[khanhntd]

Duplicate of #543