8356997: /etc/krb5.conf parser should not forbid include/includedir directives after sections

[wangweij]

Several changes are made:

1. The "include" and "includedir" directives can appear everywhere, even inside a section or a sub-section. However, it only means the content is inserted here but the included file still need its own full structure -- from section to subsections.
2. The same file can be included multiple times as long as not recursively.
3. Everything is merged. For duplicated values, get returns the first one and getAll returns all joining by spaces.

Two new tests added. I also separately confirmed that they are parsed in the same way as MIT krb5. MIT krb5 ignores directory name after "include" but here it's an error.

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• JDK-8356997: /etc/krb5.conf parser should not forbid include/includedir directives after sections (Bug - P4)

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