Add missing spaces in constructing args

We were missing a few spaces in some argument strings. This could
cause the testrunner to fail if it is used with a --run-test-option or
with multiple target options.

Test: ./test/testrunner/testrunner.py --host --jvm
Test: ./test/testrunner/testrunner.py --host --run-test-option='--with-agent libtifast.so=MethodEntry,MethodExit'
Change-Id: I8b4330c252e2f13f4591bbeadef3532ca7b31d06
1 file changed