Minor makefile edits

makefiles/consts.mk
-------------------
  o Fixed quote-{double,single} macros to use the correct values.

makefiles/include.mk
makefiles/lint/shell.mk
makefiles/virtualenv.mk
-----------------------
  o Inline a visual version string for quick sanity checking.

makefiles/lint/include.mk
makefiles/lint/license/
-------------------------
  o Check license agreements with the reuse command line tool.

Change-Id: I54b247805dc75b888ab5662e224261dabb01eab7
diff --git a/makefiles/lint/shell.mk b/makefiles/lint/shell.mk
index b1a083b..a02da31 100644
--- a/makefiles/lint/shell.mk
+++ b/makefiles/lint/shell.mk
@@ -14,6 +14,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # -----------------------------------------------------------------------
+# https://gerrit.opencord.org/plugins/gitiles/onf-make
+# ONF.makefile.version = 1.0
+# -----------------------------------------------------------------------
 
 ##-------------------##
 ##---]  GLOBALS  [---##
@@ -30,7 +33,8 @@
 # shell-check    := $(env-clean) pylint
 shell-check      := shellcheck
 
-shell-check-args += -a
+shell-check-args += --check-sourced
+shell-check-args += --extenal-sources
 
 ##-------------------##
 ##---]  TARGETS  [---##
@@ -54,4 +58,8 @@
 help-summary ::
 	@echo '  lint-shell          Syntax check shell sources'
 
+# [SEE ALSO]
+# -----------------------------------------------------------------------
+#   o https://www.shellcheck.net/wiki/Directive
+
 # [EOF]