Add missing path to exec resources

Due to hiera reformating, exec does not have a default values
for path. Hence it needs to be specified.

manifests/database/sql.pp

@@ -269,6 +269,7 @@ class cloud::database::sql (
   exec{'clean-mysql-binlog':
     # first sync take a long time
     command     => "/bin/bash -c '/usr/bin/mysqladmin --defaults-file=/root/.my.cnf shutdown ; /bin/rm  ${::mysql::params::datadir}/ib_logfile*'",
+    path        => '/usr/bin',
     require     => [
       File['/root/.my.cnf'],
       Service['mysqld'],

manifests/volume/backend/rbd.pp

@@ -82,6 +82,7 @@ define cloud::volume::backend::rbd (
 
   ensure_resource ('exec','add-cinder-to-group', {
     'command' => 'usermod -a -G cephkeyring cinder',
+    'path'    => ['/usr/bin', '/bin'],
     'unless'  => 'groups cinder | grep cephkeyring'
   })