Improve API to cover indications and source instances

With writing new tests, some limitations of current framework emerged.
For example, there has been assumption that one LMIIndication container
will only hold one CIMIndication instance.  This is mostly true so far,
but does not have to be always, so is dangersous for further decisions.

Overview of changes:

 *  Interface of IndicationTestProbe for retrieving data
    about delivered indications has been split from get_cns to
    get_indications and get_ssource_instances.  These don't expose
    LMIIndication containers, but rather collect all indications to
    one big list, and source instances to parallel list.

 *  Furthermore, as opposed to rather confusing get_cns, these new
    methods don't automatically create PackedSequence or sort
    indications.  Instead, describe_* methods have been created
    solely for this purpose.  Similar change has been done to
    get_ans, which is now split to get_actions and describe_*
    for reporting.

  * Also the number-baseded test had been oversimplified, which caused
    confusion when trying to use it with LMI_Groups, where indication
    name alias is different than sourceInstance alias.

  * Assertions about streams are now made separately for indications and
    source instances.  This is now reflected in tests, which have the
    oracles defined separately (expected_*_stream) and also have
    aggregated the repeating code to check_* methods so that new
    group assertions can be added easily on the go.

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