ipc: use strlcpy where applicable

ipc: use strlcpy where applicable

This also silences (or should silence) a few Coverity false
positives where we used strcpy before (Coverity complained
about not checking buffer size, but source buffers were
always known to be sized correctly).

Coverity issue: 260407, 272565, 272582
Fixes: bacaa2754017 ("eal: add channel for multi-process communication")
Fixes: f05e26051c15 ("eal: add IPC asynchronous request")
Fixes: 783b6e54971d ("eal: add synchronous multi-process communication")

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
Acked-by: Jianfeng Tan <jianfeng.tan@intel.com>