Use the new functions for default subbuf sizes

Use the new functions for default subbuf sizes

commit 3e230f922d67f7a47b66631f7a8cf458002b3727 upstream.

Use the functions added by the previous commit. All the occurences of
the previous defines were replaced.

[ Edit by Christian Babeux: Changes to tests/tools/Makefile.am were
  not applied because this file is not present in the stable 2.0 branch.
  Also added the relevant *_LDADD = $(top_builddir)/src/common/libcommon.la
  to the differents Makefile.am where the new functions are used. ]

Signed-off-by: Simon Marchi <simon.marchi@polymtl.ca>
Signed-off-by: David Goulet <dgoulet@efficios.com>
Signed-off-by: Christian Babeux <christian.babeux@efficios.com>