so python log system can be used with sudo logsystem.
Loggers use it by default (the handler is set on the root logger).
If that is not the intent, it can be overridden explicitly.
The main problem was that string array objects were constructed
differently:
- if constructed by the test, then the elements were constant
- if constructed by the plugin, then the elements were allocated
Modified it so that now each array contains allocated strings so
they can be handled similarly. For freeing, I have used the
str_array_free function from the plugin, so I have linked its object
into the test runner.
Happy path is now free of "definitely lost" memleaks, so the test
can be used for valgrind.
Examples are installed by default to "docdir", which refers to
PACKAGE_TARNAME variable which was empty for the python plugin Makefile.in
So the examples were installed to '.../share/doc/examples' instead
of '.../share/doc/sudo/examples'. This also made them be skipped from the
package.
Also the install target now depends on install-doc so the examples
gets installed also (similarly as other examples).
