J. David Lowe ae194c1470 etcdserver: don't activate alarm w/missing AlarmType
Narrowly prevent etcd from crashing when given a bad ACTIVATE payload, e.g.:

$ curl -d "{\"action\":\"ACTIVATE\"}" ${ETCD}/v3/maintenance/alarm
curl: (52) Empty reply from server
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2018-04-09 10:37:28 -07:00
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