Info messaging for unmapped vocabulary is incorrect for compound mappings

[dschristianson]

In catalog.py CatalogTinyDB.find_attribute_mappings, we attempt to track vocabularies that are not mapped in these lines

basin3d/basin3d/core/catalog.py

Lines 580 to 591 in c2c764c

	if attr_vocab:
	vocabs = [attr_map.datasource_vocab]
	if from_basin3d:
	vocabs = attr_map.basin3d_vocab.split(MAPPING_DELIMITER)
	# look for it in the specified vocabs, remove it from the not found list
	for vocab in vocabs:
	try:
	idx = specified_attr_vocab_not_found.index(vocab)
	specified_attr_vocab_not_found.pop(idx)
	except ValueError:
	pass

The approach is not working correctly when all mappings for a compound mapping is searched via regex, eg. 'Al:.*'

With the Alpha plugin, the following filters should generate the info message that results when the method thinks there is a vocabulary that is not mapped for the given plugin:
monitoring_feature=['A-3'], observed_property=['Al'], start_date='2016-02-01'

This is a nice to have feature so either make the code work with this case or drop the feature.