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Fix garbd's -w / WORK_DIR option

Adel Belhouane requested to merge A.B/galera-4:fix-work-dir into debian/latest

The -w option (typically enabled from /etc/default/garb with the WORK_DIR= variable) allows to save the gvwstate.dat file with cluster information elsewhere than non-writable / .

It appears a mandatory comma to separate the internal parameters configuration string was somehow lost in garb/garb_config.cpp during two possibly conflicting commits in upstream's repository:

Add command line option to specify desired working directory where https://github.com/codership/galera/commit/29d906e6239e0a4111214a8bf7f0779308f479f8

and:

Fix renaming of fc_master_slave to fc_single_primary. In particular don't https://github.com/codership/galera/commit/b3c498328b699c733e5c881fcc66a6f721ac674d

causing a syntax error when the resulting internal parameter base_dir gets used:

FATAL: Exception in creating receive loop: More than one value for key 'gcs.fc_single_primary' at ' gcs.fc_single_primary=yes base_dir=/tmp' in parameter list.

Restore the mandatory missing comma to fix this issue.

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