Schema: do not warn on duplicate items in commands.

runcmd, bootcmd, snap/commands, ubuntu-advantage/commands would
log warning (and fail if strict) on duplicate values in the commands.
But those should be allowed.  Example, it is perfectly valid to do:
   runcmd: ['sleep 1', 'sleep 1']

LP: #1764264

1 files changed, 0 insertions, 1 deletions

diff --git a/cloudinit/config/cc_runcmd.py b/cloudinit/config/cc_runcmd.py
index 539cbd5d..b6f6c807 100644
--- a/cloudinit/config/cc_runcmd.py
+++ b/cloudinit/config/cc_runcmd.py
@@ -66,7 +66,6 @@ schema = {
             'additionalProperties': False,
             'minItems': 1,
             'required': [],
-            'uniqueItems': True
         }
     }
 }