utils: Verify that callback options are correct

When using callbacks, the user must specify '--callback-to' and
'--callback-from'. Make these two arguments mutually dependant. If one
is specified, the other becomes mandatory as well.

Edit exceptions returns so they give meaningful information to the user
in case something went wrong while reading from the callback
configuration file.

Change-Id: Iaa0de0b6f01ba605407db2f37c3da97aa0cacbc2
Signed-off-by: Loys Ollivier <lollivier@baylibre.com>

0 files changed, 0 insertions, 0 deletions