allow specifying the API version of bootstrap from the command line (#10803)

Adds a --boostrap_version flag that can be used to determine which API version the bootstrap should be parsed as.

Risk Level: Low
Testing: UTs
Docs Changes: Flag docs
Release Notes: n/a
Fixes #10343

Signed-off-by: Snow Pettersen <aickck@gmail.com>

Co-authored-by: Snow Pettersen <kpettersen@netflix.com>

Mirrored from https://github.com/envoyproxy/envoy @ 62777e87edc9f16af5c7920bb86f198585789a3d

envoy/admin/v3/server_info.proto

@@ -54,7 +54,7 @@ message ServerInfo {
   CommandLineOptions command_line_options = 6;
 }
 
-// [#next-free-field: 29]
+// [#next-free-field: 30]
 message CommandLineOptions {
   option (udpa.annotations.versioning).previous_message_type =
       "envoy.admin.v2alpha.CommandLineOptions";
@@ -153,4 +153,7 @@ message CommandLineOptions {
 
   // See :option:`--disable-extensions` for details.
   repeated string disabled_extensions = 28;
+
+  // See :option:`--bootstrap-version` for details.
+  uint32 bootstrap_version = 29;
 }

envoy/admin/v4alpha/server_info.proto

@@ -54,7 +54,7 @@ message ServerInfo {
   CommandLineOptions command_line_options = 6;
 }
 
-// [#next-free-field: 29]
+// [#next-free-field: 30]
 message CommandLineOptions {
   option (udpa.annotations.versioning).previous_message_type = "envoy.admin.v3.CommandLineOptions";
 
@@ -152,4 +152,7 @@ message CommandLineOptions {
 
   // See :option:`--disable-extensions` for details.
   repeated string disabled_extensions = 28;
+
+  // See :option:`--bootstrap-version` for details.
+  uint32 bootstrap_version = 29;
 }