app/crypto-perf: fix handling of config parameters

app/crypto-perf: fix handling of config parameters

The crypto perf graphing script did not handle parsing parameters
from the JSON config files correctly.
A common parsing function is used for both EAL and app parameters,
to ensure they are handled the same way and to reduce code duplication.
Short parameters are now passed with the value being a second argument,
rather than as one argument with dividing space.
Long parameters with no expected value are supported for EAL now also.
e.g. "--no-huge" can be added to config as "no-huge": true

Fixes: f400e0b82bf1 ("app/crypto-perf: add script to graph perf results")

Signed-off-by: Ciara Power <ciara.power@intel.com>
Acked-by: Adam Dybkowski <adamx.dybkowski@intel.com>