asyncd: typo in pod
asyncd: try to reuse socket when asking node

We use one socket per process per run. So if --fork is
active, there will be no socket reuse.
asyncd: add the hostname in $0

This ease the fact when multiple async run on the same host
asyncd: fix timeout bug & adding some debug
asyncd: ignore current plugin if failing cnx to node

We should not die when failing to connect to a node. Just move forward to the
next plugin to fetch.
SyncDictFile: flush the data before rename