rgw/kms/kmip - rgw / kmip test integration.

rgw/kms/kmip - rgw / kmip test integration.

s3tests needs to know key names in order to run kms tests.
It seems desirable to have s3tests default to discovering
the names that were created by the pykmip task, and that
if there is more than one rgw connected to more than one
pykmip, that names belonging to the appropriate pykmip
instance should be used.

This logic does the following:
rgw task: save pykmip role name.
s3tests task: set kms_key (and kms_keyid2) to
these in order of priority
1	s3tests client task property ['kms_key'] (or ['kms_key2'])
2	first (second) secret created in the matching pykmip instance.
3	testkey-1 (testkey-2)

For case 2, names from the secrets have an initial "token-" stripped from them.
The assumption here is that rgw is being run with a setting such as
	rgw crypt kmip kms key template: pykmip-$keyid
therefore "pykmip-" will be prefixed back onto the key before use.

Signed-off-by: Marcus Watts <mwatts@redhat.com>