Fix the Illegal character encoder issue for repo name

[yma96]

See https://issues.redhat.com/browse/MMENG-4156

[sswguo]

Will this impact the generic proxy repo query ? I remembered we make encoder for that repo, just confirm. @ruhan1

[ruhan1]

Will this impact the generic proxy repo query ? I remembered we make encoder for that repo, just confirm. @ruhan1

I guess not. generic proxy does not use indy-client. However, should Indy allow spaces in the repo name? I wonder some others places may break if we allow such.

[sswguo]

I guess not. generic proxy does not use indy-client. However, should Indy allow spaces in the repo name? I wonder some others places may break if we allow such.

if so, that does not block this PR, we may need to add input validation for repo creation.

LGTM.

[yma96]

Ok, I'll merge this first.