This patch adds the option --list (-l) to dpdk-telemetry.py which will
print all of the available file-prefixes for DPDK processes that have
telemetry enabled.
The prefixes will also be printed if the user passes an incorrect prefix
in the --file-prefix (-f) option.
Signed-off-by: Conor Walsh <conor.walsh@intel.com>
Acked-by: Ciara Power <ciara.power@intel.com>