Add whitespaces when assigning variables in kas cofiguration.
We were getting:
WARNING: ... has a lack of whitespace around the assignment: 'BB_NUMBER_THREADS="24"'
WARNING: ... has a lack of whitespace around the assignment: 'BB_NUMBER_PARSE_THREADS="12"'
Signed-off-by: Marta Rybczynska <marta.rybczynska@ygreky.com>