Properly parse urls for ssh-keyscan use

Previously, the get_fqdn() function in known_hosts.py only worked
with urls that started with git@, and ignored any urls that started
with a normal schema type (ie. http:// or ssh://). This patch corrects
that by using urlparse to parse the hostname portion out of urls that
have a proper schema.

Fixes #7474

lib/ansible/module_utils/known_hosts.py

@@ -27,6 +27,7 @@
 # USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 import hmac
+import urlparse
 
 try:
     from hashlib import sha1
@@ -56,7 +57,8 @@ def get_fqdn(repo_url):
     """ chop the hostname out of a giturl """
 
     result = None
-    if "@" in repo_url and not repo_url.startswith("http"):
+    if "@" in repo_url and "://" not in repo_url:
+        # most likely a git@ or ssh+git@ type URL
         repo_url = repo_url.split("@", 1)[1]
         if ":" in repo_url:
             repo_url = repo_url.split(":")[0]
@@ -64,6 +66,11 @@ def get_fqdn(repo_url):
         elif "/" in repo_url:
             repo_url = repo_url.split("/")[0]
             result = repo_url
+    elif "://" in repo_url:
+        # this should be something we can parse with urlparse
+        parts = urlparse.urlparse(repo_url)
+        if parts[1] != '':
+            result = parts[1]
 
     return result