allow underscore in ALIAS name (Fixes: #3866)

Florian Schaal

2016-04-30 8beb039f0b7d23b03f7963c3a56c8dde65af3b6b

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pwcheck_method: authdaemond
log_level: 3
mech_list: PLAIN LOGIN
authdaemond_path:/var/spool/authdaemon/socket