This unifies the test scripts to all use the similar pattern added for
schematests in ace4aecd. This gives the following

- Enables running all tests from outside of tests/ dir
- Drops redundant abs_* definitions, which are set by test-lib.sh
- Drops unnecessary srcdir variable which was only used for sourcing
    test-lib.sh

Behavior changes:

- srcdir can no longer be overwritten, but I don't know why anyone would
    really need to...
- Script VERBOSE setting no longer prints commands executed by test-lib.sh.
    if anyone cares I suggest handling this in test-lib.sh which already
    has other verbose style handling

Previously it failed like:

$ ./tests/domainschematest
./tests/domainschematest: line 4: ./test-lib.sh: No such file or directory

This new module holds and formats capabilities for emulator. If you
are about to create a new domain, you may want to know what is the
host or hypervisor capable of. To make sure we don't regress on the
XML, the formatting is not something left for each driver to
implement, rather there's general format function.

The domain capabilities is a lockable object (even though the locking
is not necessary yet) which uses reference counter.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

Only print out '.' for each test case, full test output can be
re-enabled with VIR_TEST_VERBOSE=1, or VIR_TEST_DEBUG=XXXX

Sample output now looks like

  TEST: statstest
        ........................................ 40
        ...................................      75  OK
  PASS: statstest
  TEST: qparamtest
        ................................         32  OK
  PASS: qparamtest
  TEST:
        ............                             12  OK

* tests/capabilityschematest: Define and use $srcdir.
* tests/domainschematest: Likewise.
* tests/interfaceschematest: Likewise.
* tests/networkschematest: Likewise.
* tests/nodedevschematest: Likewise.
* tests/storagepoolschematest: Likewise.
* tests/storagevolschematest: Likewise.

Introduced in commit 39a7be47.

* tests/*schematest: replace 'source' with '.'
* tests/schematestutils.sh: remove 'function' keyword and add '()'

All schema tests have identical functionality, so avoid the duplication.

* tests/Makefile.am (EXTRA_DIST): Distribute domainschemadata/.
* tests/domainschematest: Fail the test if find invocation fails.

  in out of tree builds.
daniel