Disable hostname verification when ssl validation is disabled.

[emopti-jrufer]

Fixes gh-625.

Prior to Apache Http Client5 org.springframework.cloud.commons.httpclient.DefaultApacheHttpClientConnectionManagerFactory was being used which added the NoopHostnameVerifier. See https://github.com/spring-cloud/spring-cloud-commons/blob/e72fc6c6906cab8dedd1277dccffb5aeca99aec6/spring-cloud-commons/src/main/java/org/springframework/cloud/commons/httpclient/DefaultApacheHttpClientConnectionManagerFactory.java#L69

[emopti-cmeyer]

@ryanjbaxter @OlgaMaciaszek hoping you can take a look and get this merged before release to avoid unnecessary breakage. This is a 1-line fix for an issue that was introduced by the switch from Apache HttpClient 4 to 5.

@ryanjbaxter committed similar code for OkHttpClient a few weeks ago here: 1ec3c65

All this pull request does is to make sure that when the spring.cloud.openfeign.httpclient.disable-ssl-validation property is set to true, the HttpClient also ignores host name mismatches (e.g. the common name from the certificate doesn't have to match).

As described in the original pull request description, the Apache HttpClient 4 implementation was also using the NoopHostnameVerifier and as mentioned in my comment here w/ link, the OkHttpClient does the same.

[codecov]

Codecov Report

Merging #798 (f5abf98) into main (9354054) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #798      +/-   ##
============================================
- Coverage     74.51%   74.47%   -0.04%     
  Complexity      569      569              
============================================
  Files            67       67              
  Lines          2201     2202       +1     
  Branches        297      297              
============================================
  Hits           1640     1640              
- Misses          394      395       +1     
  Partials        167      167              

Impacted Files	Coverage Δ
...gn/clientconfig/HttpClient5FeignConfiguration.java	66.66% <0.00%> (-1.63%)	⬇️

[OlgaMaciaszek]

Thanks @emopti-jrufer . LGTM.