[CORE] Update features check for flavours

The function local_conf_sanity_check has been updated to consider also the variables assigned with :append and += in the local.conf.

The variables are checked over *-feature.conf files which are included in the layers needing mandatory features.

The function shortly does the following:

• check if the variables in the *-feature.conf are in the local.conf

For each variable both in local.conf and *-feature.conf:

• if a variable is assigned in local.conf with a different assignment (i.e. 0 vs +=, :append vs +=, etc), return a configuration error.

• if a variable is assigned in local.conf with a different value than the one in the *-feature.conf, return a configuration error.

• if a variable is assigned in local.conf`` & -feature.confwith the same values and operators, the one in thelocal.confare removed and the one in-feature.conf` is preserved.

• if a variable is assigned with :append or += in the local.conf, the common values are removed from local.conf as they are already in *-feature.conf. For example:

  local.conf: VAR:append = " A B"
  *-feature.conf: VAR:append = " A"
  will result in:
  local.conf: VAR:append = " B"
  *-feature.conf: VAR:append = " A"

  the same applies for += but it doesn't for =.

Signed-off-by: default avatarNicola Sparnacci nicola.sparnacci@seco.com

VERSIONING Select one of the following version increments: Version bump type: [MINOR]