Configurable gpg keyserver

src/freedombone

   fi
 
   if [ -f $CONFIGURATION_FILE ]; then
+      if grep -q "GPG_KEYSERVER" $CONFIGURATION_FILE; then
+          GPG_KEYSERVER=$(grep "GPG_KEYSERVER" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
       if grep -q "IPFS_PORT" $CONFIGURATION_FILE; then
           IPFS_PORT=$(grep "IPFS_PORT" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
       fi