bitbake.conf: DISTRO_FEATURES as overrides

As discussed in "[Openembedded-architecture] Yocto Compatible 2.0 +
signature changes", changes in .bbappend must depend on some explicit
configuration change, typically selecting a distro feature.

For _append and _remove, adding an override that is set only when the
corresponding entry is in DISTRO_FEATURES achieves that:

In local.conf:
  DISTRO_FEATURES_append = " my-distro-feature"

In layer.conf:
  DISTRO_FEATURES_OVERRIDES += "my-distro-feature"

In a .bbappend:
  do_install_append_df-my-distro-feature () {
       ...
  }

The subset of DISTRO_FEATURES that are made available as overrides
must be configured explicitly because using them this way should
be a conscious decision.

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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