Fix dev reload issues when Vmdb::Settings.reload! is called.
Fix dev reload issues when Vmdb::Settings.reload! is called.

When the global Vmdb::Settings object is created it maintains references
to instances of Vmdb::Settings::DatabaseSource.  In the recent changes
in #10886 the calls to dynamically load MiqServer.my_server were moved
into the DatabaseSource class.  Unfortunately, since we maintain a
reference to that class, when the my_server method is called after a
code reload, it tries to find the missing constant for SettingsChange.
As it walks the tree to find it, it starts at
Vmdb::Settings::DatabaseSource, which now is in the "bad" state, and
giving the error:

    [ArgumentError] A copy of Vmdb::Settings::DatabaseSource has been removed from the module tree but is still active!

The fix in this commit prefixes those calls with `::`, bypassing that
lookup at the Vmdb::Settings::DatabaseSource level, and making it start
at the top-level namespace.

In console, a failing recipe is

    reload! && Settings.reload!

Fixes #10978

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