ListDbs API should not exit the program on error
ListDbs API should not exit the program on error

it could be that the users of the API may want to re-try, so the
library API shouldn't exit on error

Signed-off-by: Girish Moodalbail <74ea68506563fcb14ffc94b33dcc0cf7da66ea4d@nvidia.com>

socketplane/libovsdb