puppet-lint: Use braces for variables in double-quoted strings.

manifests/cache.pp

@@ -54,7 +54,7 @@ class arc::cache
 
     cron {
 	'cache-clean':
-	    command => "/usr/libexec/arc/cache-clean -m90 -M95 -D INFO /export/cache >> $arc::logdir::logdir/cache-clean.log 2>&1",
+	    command => "/usr/libexec/arc/cache-clean -m90 -M95 -D INFO /export/cache >> ${arc}::logdir::logdir/cache-clean.log 2>&1",
 	    user    => 'root',
 	    month   => '*', monthday => '*', weekday => '*',
 	    hour    => '*', minute => '*/5';

manifests/devs.pp

@@ -52,8 +52,8 @@ define arc::devkeys($key, $ensure='enabled', $homepath='/home')
 	}
     }
 
-    $sshdir = "$homepath/$title/.ssh"
-    $sshauthfile = "$sshdir/authorized_keys"
+    $sshdir = "${homepath}/${title}/.ssh"
+    $sshauthfile = "${sshdir}/authorized_keys"
 
     file {
 	$sshdir: