examples/power: fix strcpy buffer overrun

examples/power: fix strcpy buffer overrun

replace strcpy with strlcpy to prevent buffer overrun
With fix, attempting to use a VERY lonng vm name results in a nicely
truncated 32 character name rather than a segfault:
Setting VM Name to [sdfdsfsfsdffdsdsasdsadasdakjshd]

Using strlcpy rather than rte_strlcpy, as the rte_ version is only a
fallback.

As well as the fix in main.c, this patch also changes an occurrence of
rte_strlcpy in channel_manager.c and channel_monitor.c to strlcpy.

Fixes: 59287933a0bb ("examples/vm_power: add options to guest app")
Cc: stable@dpdk.org
Signed-off-by: David Hunt <david.hunt@intel.com>
Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>