Add circularity check for the GRANT role
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Key: DERBY-3722
URL: https://issues.apache.org/jira/browse/DERBY-3722
Project: Derby
Issue Type: Sub-task
Components: Security, SQL
Reporter: Dag H. Wanvik
Fix For: 10.5.0.0
When a role is granted to another role (with the GRANT <role> statement), we
need to check that the grant relation does not give rise to a circularity. This
is described in Section 12.5, Syntax rule 1 of ISO/IEC 9075-2 2003.
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