scripts/compile-plugins.sh compiles plugins in parallel and supports compiling one plugin only

[klesh]

Description

scripts/compile-plugins.sh currently compile all plugins in sequential order, which is very slow. Another problem is sometimes when we working on a specific plugin, we would like to skip all other plugins and focus on one and one only.

Describe the solution you'd like

1. Let plugins compilation run in parallel
2. Remove other plugins .so and recompile the specified one if EnvVar PLUGIN is presented

Has the Feature been Requested Before?

Maybe