Raise Miq exceptions on connect

The `raw_connect` method of providers is intended to check connection and authentication details.
This method should report errors throwing instances of `MiqEVMLoginError`, `MiqInvalidCredentialsError`, etc.

This fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1510374

app/models/manageiq/providers/redhat/infra_manager/api_integration.rb

@@ -114,11 +114,26 @@ def verify_credentials_for_rhevm(options = {})
     raise e
   rescue RestClient::Unauthorized
     raise MiqException::MiqInvalidCredentialsError, "Incorrect user name or password."
+  rescue OvirtSDK4::Error => e
+    rethrow_as_a_miq_error(e)
   rescue
     _log.error("Error while verifying credentials #{$ERROR_INFO}")
     raise MiqException::MiqEVMLoginError, $ERROR_INFO
   end
 
+  def rethrow_as_a_miq_error(e)
+    byebug
+    case e.message
+    when /The username or password is incorrect/
+      raise MiqException::MiqInvalidCredentialsError
+    when /Couldn't connect to server/, /Couldn't resolve host name/
+      raise MiqException::MiqUnreachableError, $ERROR_INFO
+    else
+      _log.error("Error while verifying credentials #{$ERROR_INFO}")
+      raise MiqException::MiqEVMLoginError, $ERROR_INFO
+    end
+  end
+
   def rhevm_metrics_connect_options(options = {})
     metrics_hostname = connection_configuration_by_role('metrics')
                        .try(:endpoint)