B #7404: Coerce Restic retry options

Coerce :retries and :delay in run_with_lock_retry before using them.

This preserves the previous remove_snapshots behavior for callers passing
retry options as strings.

Author: rsmontero

src/datastore_mad/remotes/restic/restic.rb

@@ -343,6 +343,9 @@ def run_with_lock_retry(name, script, rhost, opts = {})
             :delay   => 5
         }.merge!(opts)
 
+        options[:retries] = options[:retries].to_i
+        options[:delay]   = options[:delay].to_i
+
         rc = nil
         options[:retries].times do
             rc = run_action name, script, rhost