app/pdump: remove unused socket path options

app/pdump: remove unused socket path options

The options --server-socket-path and --client-socket-path
were said to be deprecated and will be removed soon.
No need to wait for removing application options which have
no effect, and can confuse the user.

Fixes: 660098d61f57 ("pdump: use generic multi-process channel")
Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Reviewed-by: Jianfeng Tan <jianfeng.tan@intel.com>
Acked-by: Reshma Pattan <reshma.pattan@intel.com>