Add support for Galera xtrabackup donor availability
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		@ -435,6 +435,7 @@ backend_write_timeout=2
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# galeramon specific options
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disable_master_failback=0
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available_when_donor=0
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```
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#### `module`
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@ -499,6 +500,12 @@ The server status field may have the `SERVER_MASTER_STICKINESS` bit, meaning the
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Anyway, a new master will be selected in case of current master failure, regardless the option value.
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#### `available_when_donor`
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This option if set to 1 will allow Galera monitor to keep a node in `Donor` status in the server pool if it is using any xtrabackup method for SST, e.g. `wsrep_sst_method` equal to `xtrabackup` or `xtrabackup-v2`.
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As xtrabackup is a non-locking SST method, a node in `Donor` status can still be considered in sync. This option is not enabled by default and should be used as the administrator's discretion.
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#### `backend_connect_timeout`
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This option, with default value of `3` sets the monitor connect timeout to backends.
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