conf: Install strongswan.conf template from a separate directory

conf/strongswan.conf

@@ -0,0 +1,34 @@
+# strongswan.conf - strongSwan configuration file
+
+charon {
+
+	# number of worker threads in charon
+	threads = 16
+
+	# send strongswan vendor ID?
+	# send_vendor_id = yes
+
+	plugins {
+
+		sql {
+			# loglevel to log into sql database
+			loglevel = -1
+
+			# URI to the database
+			# database = sqlite:///path/to/file.db
+			# database = mysql://user:password@localhost/database
+		}
+	}
+
+	# ...
+}
+
+pluto {
+
+}
+
+libstrongswan {
+
+	#  set to no, the DH exponent size is optimized
+	#  dh_exponent_ansi_x9_42 = no
+}