[6.15.z] Fix ipv6 proxy url validation (#15615)

Fix ipv6 proxy url validation (#15594)

Fix ipv6 proxy url validation:

http_proxy_url is validated in Validators already

(cherry picked from commit a6b4131)

Co-authored-by: dosas <[email protected]>

robottelo/hosts.py

@@ -1646,7 +1646,7 @@ def enable_capsule_downstream_repos(self):
 
     def enable_ipv6_http_proxy(self):
         """Execute procedures for enabling IPv6 HTTP Proxy on Capsule using SM"""
-        if all([settings.server.is_ipv6, settings.server.http_proxy_ipv6_url]):
+        if settings.server.is_ipv6:
             url = urlparse(settings.server.http_proxy_ipv6_url)
             self.enable_rhsm_proxy(url.hostname, url.port)
 
@@ -1826,7 +1826,7 @@ def _swap_nailgun(self, new_version):
 
     def enable_ipv6_http_proxy(self):
         """Execute procedures for enabling IPv6 HTTP Proxy"""
-        if not all([settings.server.is_ipv6, settings.server.http_proxy_ipv6_url]):
+        if not settings.server.is_ipv6:
             logger.warning(
                 'The IPv6 HTTP Proxy setting is not enabled. Skipping the IPv6 HTTP Proxy setup.'
             )
@@ -2411,7 +2411,7 @@ def register_contenthost(
     ):
         """Satellite Registration to CDN"""
         # Enabling proxy for IPv6
-        if enable_proxy and all([settings.server.is_ipv6, settings.server.http_proxy_ipv6_url]):
+        if enable_proxy and settings.server.is_ipv6:
             url = urlparse(settings.server.http_proxy_ipv6_url)
             self.enable_rhsm_proxy(url.hostname, url.port)
         return super().register_contenthost(