Fix IVY-1495

[jaikiran]

The commit here is a potential fix for the issue reported in https://issues.apache.org/jira/browse/IVY-1495. The issue happens when the ivysettings.xml is being parsed and the IvySettings instance isn't yet available for getting hold of a relevant matcher referred to in the ttl config.

The commit here delays the access to the matcher from the settings instance, to when the settings instance is available.

The commit also includes a test case to verify the change.

[jaikiran]

FWIW - the test failures don't look related. That WarnCircularDependencyStrategyTest testcase though probably needs to be looked into separately, since it keeps failing once in a while on Jenkins.

[jaikiran]

That WarnCircularDependencyStrategyTest testcase though probably needs to be looked into separately, since it keeps failing once in a while on Jenkins.

I think this #22 should fix the transient test failures.

[jaikiran]

Reopening this one