[BugFix] Docker InfluxDB cannot be enabled (#4483)

Motivation:

This patch fixes the bug that there's no chance to enable the InfluxDB storage in docker container.

Modifications:

Generate InfluxDB configuration section to enable it.

Result:

Users can enable InfluxDB by specifying SW_STORAGE=influxdb

docker/oap-es7/docker-entrypoint.sh

@@ -355,6 +355,7 @@ EOT
     elasticsearch) generateStorageElastisearch;;
     h2) generateStorageH2;;
     mysql) generateStorageMySQL;;
+    influxdb) generateStorageInfluxDB;;
     esac
 
     cat <<EOT >> ${var_application_file}

docker/oap/docker-entrypoint.sh

@@ -356,6 +356,7 @@ EOT
     elasticsearch) generateStorageElastisearch;;
     h2) generateStorageH2;;
     mysql) generateStorageMySQL;;
+    influxdb) generateStorageInfluxDB;;
     esac
 
     cat <<EOT >> ${var_application_file}