Add Support for IPv6 metadata to OpenStack (#1805)

- Add openstack IPv6 metadata url fe80::a9fe:a9fe
- Enable requesting multiple metadata sources in parallel

This PR is very similar to #1160, reusing the provided `url_heper` logic.

LP: #1906849

cloudinit/sources/DataSourceOpenStack.py

@@ -18,7 +18,7 @@
 LOG = logging.getLogger(__name__)
 
 # Various defaults/constants...
-DEF_MD_URL = "http://169.254.169.254"
+DEF_MD_URLS = ["http://[fe80::a9fe:a9fe]", "http://169.254.169.254"]
 DEFAULT_IID = "iid-dsopenstack"
 DEFAULT_METADATA = {
     "instance-id": DEFAULT_IID,
@@ -74,7 +74,7 @@ def __str__(self):
         return mstr
 
     def wait_for_metadata_service(self):
-        urls = self.ds_cfg.get("metadata_urls", [DEF_MD_URL])
+        urls = self.ds_cfg.get("metadata_urls", DEF_MD_URLS)
         filtered = [x for x in urls if util.is_resolvable_url(x)]
         if set(filtered) != set(urls):
             LOG.debug(
@@ -85,7 +85,7 @@ def wait_for_metadata_service(self):
             urls = filtered
         else:
             LOG.warning("Empty metadata url list! using default list")
-            urls = [DEF_MD_URL]
+            urls = DEF_MD_URLS
 
         md_urls = []
         url2base = {}
@@ -100,6 +100,7 @@ def wait_for_metadata_service(self):
             urls=md_urls,
             max_wait=url_params.max_wait_seconds,
             timeout=url_params.timeout_seconds,
+            connect_synchronously=False,
         )
         if avail_url:
             LOG.debug("Using metadata source: '%s'", url2base[avail_url])

tools/.github-cla-signers

@@ -98,6 +98,7 @@ rmhsawyer
 rongz609
 s-makin
 SadeghHayeri
+SRv6d
 sarahwzadara
 scorpion44
 shaardie