add a test to cover that if key_identifier does not start with issuer then an error is raised in verify_claims.
add a test to cover that if key_identifier does not start with issuer then an error is raised in verify_claims.

Signed-off-by: David Black <c4b737561a711e07c31fd1e1811f33a5d770e31c@atlassian.com>

atlassian/asap-authentication-python