Don't allow slave nodes to survive their test case

The slave node from release_handler_SUITE:upgrade_supervisor_fail
sometimes survives its test case. Or rather, it is unexpectedly
restarted. Every now and then, on a slow machine, this confuses the
next test case since test_server:start_node might return the old node
name instead of the new. This has been corrected by using
{error_action,reboot} in release_handler_SUITE:upgrade_supervisor_fail
- to make sure the slave node is really terminated on rollback.
Skip test when needed applications are missing

On some test hosts a lot of applications are skipped from the erlang
installation in order to make test go faster.

systools_SUITE:app_start_type_relup uses a few applications which
therefore might not exist. This commit make sure the test is skipped
(instead of fail) if some of the needed applications are missing.
Update kernel, stdlib and sasl appup tests

Add test of update instructions from current major to current
minor. Earlier only previous major to current was tested.
Fix regexp in release_handler test so versions are correctly replaced

In order to fake an earlier release to upgrade from, version numbers
are replaced in some .app files. This commit adds a backslash before
the dot in the pattern to replace, so the dot is not mistaken for a
wildcard.