test: Add newlines to hush-test messages

test: Add newlines to hush-test messages

A few messages lack a newline so the test output shows the next
test-name on the same line. For example:

   Beware: this test sets local variable dollar_bar and dollar_quux
      and they cannot be unset!Test: hush_test_env_dollar: dollar.c

This is confusing, so fix it.

Signed-off-by: Simon Glass <sjg@chromium.org>