Add --no-added-syms to abipkgdiff

Add --no-added-syms to abipkgdiff

With this new option the tool ignores added functions, variables and
their symbols.

	* tools/abipkgdiff.cc (options::show_added_syms): New data member.
	(options::options): Initialize it.
	(parse_command_line): Parse the new --no-added-syms option and set
	the options::show_added_syms flag accordingly.
	(display_usage): Add a help string for the new option.
	(set_diff_context_from_opts): Set the diff context according to
	the state of the new options::show_added_syms flag.
	* doc/manuals/abipkgdiff.rst: Add manual entry for the new
	--no-added-syms options.
	* tests/data/test-diff-pkg/test-rpm-report-5.txt: New test
	reference input file.
	* tests/data/Makefile.am: Add the new file above to source
	distribution.
	* tests/test-diff-pkg.cc (InOutSpec::prog_options): New data
	member.
	(in_out_specs): Adjust.  Add a new input to run the test again
	with --no-added-syms.
	(main): Adjust to pass the program options contained in
	InOutSpec::prog_options to abipkgdiff.

Signed-off-by: Dodji Seketeli <dodji@redhat.com>
fixup! Add --no-added-syms to abipkgdiff

Signed-off-by: Dodji Seketeli <dodji@redhat.com>