Fix error reporting for fetch_key (#2662)

Since fetch_url already take care of the exception, the try/except
clause is no longer working, so replace it with proper status
checking, thus permitting to remove urlib2 from the import list.

lib/ansible/modules/packaging/os/rpm_key.py

@@ -62,7 +62,6 @@ EXAMPLES = '''
 '''
 import re
 import os.path
-import urllib2
 import tempfile
 
 def is_pubkey(string):
@@ -115,8 +114,10 @@ class RpmKey:
 
     def fetch_key(self, url):
         """Downloads a key from url, returns a valid path to a gpg key"""
-        try:
         rsp, info = fetch_url(self.module, url)
+        if info['status'] != 200:
+            self.module.fail_json(msg="failed to fetch key at %s , error was: %s" % (url, info['msg']))
+
         key = rsp.read()
         if not is_pubkey(key):
             self.module.fail_json(msg="Not a public key: %s" % url)
@@ -125,8 +126,6 @@ class RpmKey:
         tmpfile.write(key)
         tmpfile.close()
         return tmpname
-        except urllib2.URLError, e:
-            self.module.fail_json(msg=str(e))
 
     def normalize_keyid(self, keyid):
         """Ensure a keyid doesn't have a leading 0x, has leading or trailing whitespace, and make sure is lowercase"""