See aebf5bf2 "fdo#52232 ConfigurationSet wrapper
unusable for localized properties" for a discussion of the problems with the
original design.

1  Redesigned configmgr's localized property access to understand ['*<locale>']
paths that select the best existing value match for the requested <locale>.
Adapted ConfigurationWrapper::getLocalizedPropertyValue accordingly.

2  Redesigned ConfigurationChanges to fix the locale at instantiation time.
That takes care of ConfigurationWrapper::setLocalizedPropertyValue,
ConfigurationWrapper::getGroupReadWrite, and
ConfigurationWrapper::getSetReadWrite.  (This required an additional constructor
parameter for the ReadWriteAccess service, to specify a locale at instantiation
time.)

3  Redesigned ReadOnlyAccess to be a service that fixes the locale at
instantiation time.  That allows to take care of
ConfigurationWrapper::getGroupReadOnly and ConfigurationWrapper::getSetReadOnly.

Change-Id: I2ae7342b278b6f4222a0189a1deb2a53e204059f