* NIFI-7804 Split nifi-security-utils into sub-module for nifi-security-utils-api (no external dependencies).
Separated interface and implementation of TlsConfiguration.
Reabsorbed nifi-security-xml-config into nifi-security-utils.
* NIFI-7804 Resolved failing unit test on Java 8.
Removed accidental module dependency.
* NIFI-7804 Resolved failing unit test.
* NIFI-7804 Removed legacy dependency.
* NIFI-7804 Marked nifi-security-utils-api as provided and overrode with compile scope in specific modules which are not children of nifi-standard-services-api-nar.
NIFI-6323 Changed URLs for splunk.artifactoryonline.com to use HTTPS (certificate validity warning in browsers, but command-line connection using openssl s_client is successful).
NIFI-6323 Changed URLs for XMLNS schema locations to use HTTPS (the XMLNS and schema identifier remain http:// because they are not designed to be resolvable).
NIFI-6323 Fixed Maven XML schema descriptor URLs.
This closes#3497