Integrate seco-build-configurator/nspa/multiline and 1 more

Commit: clea-os/tools/seco-build-configurator@fd8fa3f3

[CLUSTER] Add FEATURE-APPEND

This cluster adds to local.conf a variable with += assignment.

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

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Commit: clea-os/tools/seco-build-configurator@e05c6700

[CORE] Add variable merge in local.conf

Added a function that unifies multiple assignments of a single variable into a single assignment. For example:

VAR = "test"
VAR += "second-test

ends up with:

VAR += " \
   test \
   second-test \
"

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