Integrate meta-seconorth-distro/add-manifest-and-testdata-files-to-release-artifacts

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Commit: seco-ne/yocto/layers/meta-seconorth-distro@a316e95e

Refactoring: remove DISTRO_IMAGES variable

DISTRO_IMAGES was passed to the CI package stage only to add the
corresponding manifest and testdata.json files as well. Add these
directly to DISTRO_RELEASE_ARTEFACTS and remove DISTRO_IMAGES variable.

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Commit: seco-ne/yocto/layers/meta-seconorth-distro@ba99e05b

Refactoring: remove DISTRO_INSTALL_SCRIPTS

This variable is not needed anywhere else, so we can use its value
directly.

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Commit: seco-ne/yocto/layers/meta-seconorth-distro@1846382a

Refactoring: append to DISTRO_IMAGES for FNGSystem instead of redefining it

${IMAGE_LINK_NAME}.cpio.gz is part of DISTRO_IMAGES automatically due to
its original definition in seconorth-distro.inc. Append
${IMAGE_LINK_NAME}.tgz to make clear that this is an addition compared
to the Yocto build.

default.xml

@@ -22,7 +22,7 @@
     <project name="meta-freescale.git"              revision="dd98526300937450d741c9b3403799632f417226"  remote="fslc"         path="sources/meta-freescale"            />
     <project name="meta-freescale-distro.git"       revision="fc15f5003043da23212596be7366ae2547c308ad"  remote="fslc"         path="sources/meta-freescale-distro"     />
     <project name="layers/meta-seconorth-machine"   revision="4ff18c10335b8438e51ba688632cb1133d34ff96"  remote="seco-ne"      path="sources/meta-seconorth-machine"    />
-    <project name="layers/meta-seconorth-distro"    revision="26b9e2f4bc088afcf3ebf3e188c1d132bdf56676"  remote="seco-ne"      path="sources/meta-seconorth-distro"     />
+    <project name="layers/meta-seconorth-distro"    revision="a316e95e07325a22d3ee77111161ff5a42711b76"  remote="seco-ne"      path="sources/meta-seconorth-distro"     />
     <project name="layers/meta-seconorth-nogplv3"   revision="7bcc7f5e5bdf03287d2a1bc2abb57417337c4d6e"  remote="seco-ne"      path="sources/meta-seconorth-nogplv3"    />
     <project name="config"                          revision="65a30c03db65e5fcb585c9aa53ac973e353a522d"  remote="seco-ne"      path=".conf"                              >
         <linkfile dest="setup-environment" src="setup-environment" />