expose is_systemdb_name

[garrensmith]

Overview

Based off of aa63804
I want to expose a function we can use in multiple places that is a good check if a binary field is a system db. Once this is merged I want to use it in the partition feature branch.

Testing recommendations

All Current tests should pass

Checklist

• Code is written and works correctly;
• Changes are covered by tests;

[rnewson]

is_system_db_name is my suggestion for a better name. This function only tests the name, after all. The other function is_system_db only tests #db{} records, so the two names are distinct and complementary.

[rnewson]

is_valid_systemdb is not distinct from is_systemdb, this doesn't seem a helpful name (not least because it won't detect all valid system dbs).

[rnewson]

+1 but please update title and commit message to match.

[rnewson]

+1 but please update title and commit message to match.

[rnewson]

+1 but please update title and commit message to match.

[rnewson]

+1 but please update title and commit message to match.

[rnewson]

+1 but please update title and commit message to match.

[rnewson]

+1 but please update title and commit message to match.

[rnewson]

+1 but please update title and commit message to match.

[rnewson]

+1 but please update title and commit message to match.