[pmix server] Fix typos, fix oputput in pmix_server_init.
[pmix server] Refactor stuff_proc_values:
1. Rename it to pmix_server_proc_info.
2. Split it onto platform-independent/dependent parts.
3. Introduce PMIX_ADD_KP to make pmix_server_proc_info more readable.
[Compilation - OK, Runtime check - OK]