conf: Options of all plugins documented

Some options are still missing descriptions though.

conf/plugins/stroke.opt

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+charon.plugins.stroke.ignore_missing_ca_basic_constraint = no
+	Treat certificates in ipsec.d/cacerts and ipsec.conf ca sections as CA
+	certificates even if they don't contain a CA basic constraint.
+
+charon.plugins.stroke.max_concurrent = 4
+	Maximum number of stroke messages handled concurrently.
+
+charon.plugins.stroke.prevent_loglevel_changes = no
+	If enabled log level changes via stroke socket are not allowed.
+
+charon.plugins.stroke.socket = unix://${piddir}/charon.ctl
+	Socket provided by the stroke plugin.
+
+charon.plugins.stroke.timeout = 0
+	Timeout in ms for any stroke command. Use 0 to disable the timeout.