Update codenvy config and update of Codenvy version hung up on https://<hostname> address

[dmytro-ndp]

Codenvy update from binaries command hung up on because there is wrong url of checking aliveness of codenvy on-prem API server:

codenvy/cdec/installation-manager-core/src/main/java/com/codenvy/im/managers/ConfigManager.java

Line 375 in 792d4fe

return "http://localhost/api";

return "http://localhost/api";

There should be:

return "$host_protocol://$host_url/api";

We need to use dns of Codenvy instead of localhost in case of using https protocol when verifying Codenvy aliveness so as SSL-certificate signed to these one.
Use next command instead of HttpTransport:request() method class to avoid hanging up in time of requesting when Codenvy on-prem installed behind the proxy and dns is'not real.

curl -X OPTIONS {host_protocol}//:{host_url}/api/

Another possible solution: to change method OPTIONS on GET in request to https://codenvy.onprem/api/

Codenvy version: <= 4.6.0-SNAPSHOT
Problem can be reliably reproduced: Yes

[bmicklea]

@vkuznyetsov shouldn't this issue have a sprint/... label?