ci: review #78, fix verification files & standardise structure [skip ci]

* Semi-automated using https://github.com/myii/ssf-formula/pull/363

test/integration/appended/files/_mapdata/gentoo-2-sysd.yaml

@@ -22,7 +22,7 @@ values:
         - ALL=(ALL) ALL
   includedir: /etc/sudoers.d
   manage_main_config: false
-  pkg: sudo
+  pkg: app-admin/sudo
   purge_includedir: false
   users:
     kitchen:

test/integration/appended/files/_mapdata/gentoo-2-sysv.yaml

@@ -22,7 +22,7 @@ values:
         - ALL=(ALL) ALL
   includedir: /etc/sudoers.d
   manage_main_config: false
-  pkg: sudo
+  pkg: app-admin/sudo
   purge_includedir: false
   users:
     kitchen:

test/integration/appended/inspec.yml

@@ -5,7 +5,8 @@ name: appended
 title: sudoers formula
 maintainer: SaltStack Formulas
 license: Apache-2.0
-summary: Verify that the sudoers formula is setup and configured correctly
+# yamllint disable-line rule:line-length
+summary: Verify that the sudoers formula is setup and configured correctly (when appending to the main file)
 depends:
   - name: share
     path: test/integration/share