speed up container startup (#174)

piaware-config is pretty slow, just use a function to replace it as it
only writes to /etc/piaware.conf anyhow

rootfs/etc/s6-overlay/scripts/01-piaware

@@ -5,6 +5,11 @@
 rm /etc/piaware.conf > /dev/null 2>&1 || true
 touch /etc/piaware.conf
 
+# piaware-config is very slow, as we have full control over the config file, just use a function to directly write the config settings into the config file
+function piaware-config() {
+    echo "$1 \"$2\"" | tee -a /etc/piaware.conf
+}
+
 # Check to make sure the correct command line arguments have been set
 EXITCODE=0
 if [[ -n "${USERNAME}" ]]; then
@@ -76,7 +81,7 @@ fi
 
 # If MLAT_RESULTS_BEAST_CONNECT is specified
 if [[ -n "$MLAT_RESULTS_BEASTHOST" ]]; then
-  piaware-config mlat-results-format "$(piaware-config -show mlat-results-format) beast,connect,${MLAT_RESULTS_BEASTHOST}:${MLAT_RESULTS_BEASTPORT:-30104}"
+  piaware-config mlat-results-format "beast,connect,localhost:30104 beast,listen,30105 ext_basestation,listen,30106 beast,connect,${MLAT_RESULTS_BEASTHOST}:${MLAT_RESULTS_BEASTPORT:-30104}"
 fi
 
 # Create log dir for piaware