check/gst/gstpad.c: add tests for valid pad naming

check/gst/gstpad.c: add tests for valid pad naming

Original commit message from CVS:

* check/gst/gstpad.c: (GST_START_TEST), (name_is_valid),
(gst_pad_suite):
add tests for valid pad naming
* gst/check/gstcheck.c: (gst_check_log_message_func),
(gst_check_log_critical_func):
add ASSERT_WARNING
remove printing of code, it is fragile when the code contains
% and the line number is enough info
* gst/check/gstcheck.h:
* gst/gstpad.c: (gst_pad_template_new):
fix memleaks