[binutils-gdb] delete_breakpoints: Rewrite using gdb_test_multiple

[sergiodj+buildbot@redhat.com]

*** TEST RESULTS FOR COMMIT d8b901edd1a9b717bd397400ce498c7a2d9504d0 ***

Author: Pedro Alves <palves@redhat.com>
Branch: master
Commit: d8b901edd1a9b717bd397400ce498c7a2d9504d0

delete_breakpoints: Rewrite using gdb_test_multiple
Because delete_breakpoints uses gdb_expect directly, an internal error
results in slow timeouts instead of quickly bailing out.  This patch
rewrites the procedure to use gdb_test_multiple instead, while
preserving the existing general logic ("delete breakpoints" + "info
breakpoints").

gdb/testsuite/
2015-02-23  Pedro Alves  <palves@redhat.com>

	* lib/gdb.exp (delete_breakpoints): Rewrite using
	gdb_test_multiple.