branches: 1.1.2;
Add ATF tests for printf(1)

Two new test programs, one for the version of printf in /bin/sh
and one for the command /usr/bin/printf (t_builtin and t_command)

Each test program has 28 test cases (the same in each) of which
currently 27 pass, and 1 is skipped.

See the test scripts themselves for more information.