Atlas doesn’t support qualified names without db/cluster - no matter whether default or not

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In those line, while we try to make a qualified name with either db='default' or cluster='default' it does not include it.
Nowhere atlas rest apis mentioned that they will consider "default" if not given for db/cluster.

atlasclient/atlasclient/utils.py

Lines 171 to 176 in 02b3e7d

	qualified_name = table_name
	if db and db != DEFAULT_DB_CLUSTER:
	qualified_name = '{}.{}'.format(db, qualified_name)
	if cluster and cluster != DEFAULT_DB_CLUSTER:
	qualified_name = '{}@{}'.format(qualified_name, cluster)

Check this screenshot.

Test case:

make_table_qualified_name('abc', 'primary', 'default')

Expected Output:

default.abc@primary

Actual Output:

abc@primary