Bug 22436 - make abipkgdiff accept several debuginfo packages

Bug 22436 - make abipkgdiff accept several debuginfo packages

Sometimes, the debug information for one given package P can have been
split into several packages.  In that case, we need abipkgdiff to
consider several debug info packages for a given input binary package.

This patch makes abipkgdiff to accept several --d{1,2} <debug-info-package>
option, for a given input package.

	* doc/manuals/abipkgdiff.rst: Document the fact that --d{1,2} can
	be provided several times on the command line.
	* tools/abipkgdiff.cc (options::debug_packages{1,2}): Rename the
	debug_package{1,2} data members into this, and make them be vector
	of strings, rather than just strings.
	(package::debug_info_packages_): Renamed
	package::debug_info_package_ into this and make it be a vector of
	package_sptr, rather than just a package_sptr.
	(package::debug_info_packages): Renamed the method
	package::debug_info_package into this and -- for the getter
	overload -- make it return a vector of package_sptr, rather than
	just a package_sptr.  Likewise for the setter overload.  Add a
	non-const getter overload.
	(package::erase_extraction_directories)
	(extract_package_and_map_its_content): Adjust.
	(extract_rpm, extract_deb): Do not erase the content of the
	extraction directory (if it was pre-existing) prior to extracting
	the RPM/deb into it.
	(pkg_extraction::pkgs): Renamed pkg_extraction::pkg into this and
	make it be a vector of packages, rather than just a package.
	(pkg_extraction::pkg_extraction): Adjust to take a package_sptr
	rather than just a package.  Add an overload to take a vector of
	packages_sptr.
	(pkg_extraction::perform): Extract the vector of package that the
	task is not responsible for, not just one random package.
	(extract_package_and_map_its_content): Adjust.
	(prepare_packages): Take smart pointers to package rather than
	just packages.  Adjust accordingly.
	(compare_prepared_package): Make the overload that takes two
	packages to take two smart pointers of packages.
	(compare): Make the overload that takes two package take two
	package_sptr.
	(parse_command_line): Parse having --d{1,2} several times for a
	given input package.
	(main): Take several debug info packages for one input file.
	* include/abg-tools-utils.h (split_string): Declare ...
	* src/abg-tools-utils.cc (split_string): ... new function.
	* tests/data/test-diff-pkg/libxfce4ui-debuginfo-4.12.1-8.fc27.ppc64.rpm:
	Add a new RPM test input file.
	* tests/data/test-diff-pkg/libxfce4ui-devel-4.12.1-8.fc27.ppc64-self-report-ok-0.txt:
	new reference output file.
	* tests/data/Makefile.am: Add the new test input files above to source
	distribution.
	* tests/test-diff-pkg.cc (in_out_spec): Add new test entry to
	specify two debug info packages for one input package.
	(test_task::perform): Support having several debug info package
	paths in the IntOutSpec::{first,second}_in_debug_package_path data
	member.  The debug info packages paths are separated by either a
	white space or commas.

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