Node Groups: 'L@foo.domain.com,bar.domain.com,baz.domain.com or bl*.domain.com' not 'and'

use 'and' at this confuse me, and in the http://docs.saltstack.com/topics/targeting/nodegroups.html also use 'or'.
Merge pull request #5294 from yinchuan/develop

Node Groups: 'L@foo.domain.com,bar.domain.com,baz.domain.com or bl*.doma...