chore(license): delete default config and add info to i18n

lib-ee/emqx_license/etc/emqx_license.conf

@@ -1,6 +0,0 @@
-license {
-    # The default license has 1000 connections limit, it is issued on 20220419 and valid for 5 years (1825 days)
-    key = "MjIwMTExCjAKMTAKRXZhbHVhdGlvbgpjb250YWN0QGVtcXguaW8KZGVmYXVsdAoyMDIyMDQxOQoxODI1CjEwMDAK.MEQCICbgRVijCQov2hrvZXR1mk9Oa+tyV1F5oJ6iOZeSHjnQAiB9dUiVeaZekDOjztk+NCWjhk4PG8tWfw2uFZWruSzD6g=="
-    connection_low_watermark = 75%,
-    connection_high_watermark = 80%
-}

lib-ee/emqx_license/i18n/emqx_license_schema_i18n.conf

@@ -2,6 +2,10 @@ emqx_license_schema {
   license_root {
     desc {
       en: "Defines the EMQX Enterprise license. \n\n"
+          "\n"
+          "The default license has 1000 connections limit, it is "
+          "issued on 2022-04-19 and valid for 5 years (1825 days).\n"
+          "\n"
           "EMQX comes with a default trial license.  For production use, please \n"
           "visit https://www.emqx.com/apply-licenses/emqx to apply."
       zh: "EMQX企业许可证。\n"

lib-ee/emqx_license/test/emqx_license_test_lib.erl

@@ -77,6 +77,6 @@ make_license(Values) ->
     iolist_to_binary([EncodedText, ".", EncodedSignature]).
 
 default_license() ->
-    %% keep it the same as in etc/emqx_license.conf
+    %% keep it the same as in emqx_license_schema.erl
     "MjIwMTExCjAKMTAKRXZhbHVhdGlvbgpjb250YWN0QGVtcXguaW8KZGVmYXVsdAoyMDIyMDQxOQoxODI1CjEwMDAK."
     "MEQCICbgRVijCQov2hrvZXR1mk9Oa+tyV1F5oJ6iOZeSHjnQAiB9dUiVeaZekDOjztk+NCWjhk4PG8tWfw2uFZWruSzD6g==".