Add tests for some byte-compiler warnings

Add tests for some byte-compiler warnings

* test/lisp/emacs-lisp/bytecomp-tests.el
(bytecomp-warn/warn-interactive-only\.el)
(bytecomp-warn/warn-obsolete-defun\.el)
(bytecomp-warn/warn-obsolete-hook\.el)
(bytecomp-warn/warn-obsolete-variable-same-file\.el)
(bytecomp-warn/warn-obsolete-variable\.el): New tests.
* test/lisp/emacs-lisp/bytecomp-resources/warn-interactive-only.el:
* test/lisp/emacs-lisp/bytecomp-resources/warn-obsolete-defun.el:
* test/lisp/emacs-lisp/bytecomp-resources/warn-obsolete-hook.el:
* test/lisp/emacs-lisp/bytecomp-resources/warn-obsolete-variable-same-file.el:
* test/lisp/emacs-lisp/bytecomp-resources/warn-obsolete-variable.el:
New files.