Updated keymaker behaviour

[ZhmakAS]

Updated keymaker tool to be able to generate keys that are not using client_id with its empty definition.
client_id will be validated only for generation of keys with required client_id

Checklist

• [+] Change is covered by automated tests
• [+] The coding guidelines are followed
• [-] Public API has proper documentation in the Acra documentation site or has PR on documentation repository
  with new changes
• [ -] CHANGELOG.md is updated (in case of notable or breaking changes)
• [-] CHANGELOG_DEV.md is updated
• [+] Benchmark results are attached (if applicable)
• [+] Example projects and code samples are up-to-date (in case of API changes)

[Lagovas]

what will print next code:

a =  '--client_id='''
print(a)

?

I suggest to rewrite this literal to '--client_id' or "--client_id=''" to be more readable what the actual value will be used. Because now we check client_id validation, not empty value)

[ZhmakAS]

Actually, this code will produce just -client_id= which is totally fine for our scenario, but in case of simply passing --client_id it wont start because you are passing param but not specified its value:)

a =  '--client_id='''
print(a)

[Lagovas]

lgtm if CI tests pass