Rename taxonomy tables.
function taxonomy_update_7001() {
db_rename_table('term_data', 'taxonomy_term_data');
db_rename_table('term_hierarchy', 'taxonomy_term_hierarchy');
db_rename_table('term_node', 'taxonomy_term_node');
db_rename_table('term_relation', 'taxonomy_term_relation');
db_rename_table('term_synonym', 'taxonomy_term_synonym');
db_rename_table('vocabulary', 'taxonomy_vocabulary');
db_rename_table('vocabulary_node_types', 'taxonomy_vocabulary_node_type');
}