Add some output to dib-lint

It's hard to tell if dib-lint is working as it outputs nothing.  Add
some minimal output strings at some key points.

Change-Id: Id11cc9ecb8d5215d6fc8d8ef3584bfeeba53ff13

bin/dib-lint

@@ -58,6 +58,8 @@ error() {
     rc=1
 }
 
+echo "Running dib-lint in $(pwd)"
+
 rc=0
 TMPDIR=$(mktemp -d /tmp/tmp.XXXXXXXXXX)
 trap "rm -rf $TMPDIR" EXIT
@@ -70,6 +72,8 @@ for i in $(find elements -type f   \
                 -not -name \*.py   \
                 -not -name \*.pyc); do
 
+    echo "Checking $i"
+
     exclusions=("$(parse_exclusions $i)")
 
     # Check that files starting with a shebang are +x
@@ -148,6 +152,8 @@ for i in $(find elements -type f   \
     fi
 done
 
+echo "Checking indents..."
+
 for i in $(find elements -type f -and -name '*.rst' -or -type f -executable); do
     # Check for tab indentation
     if ! excluded tabindent; then
@@ -170,6 +176,8 @@ if ! excluded mddocs; then
     fi
 fi
 
+echo "Checking YAML & JSON parsing"
+
 for i in $(find elements -name '*.yaml' \
                 -o \( -name pkg-map -type f -a \! -executable \)); do
     py_check="
@@ -192,4 +200,10 @@ sys.exit(1)"
     fi
 done
 
+if [[ $rc == 0 ]]; then
+    echo "PASS"
+else
+    echo "*** FAIL: Some tests failed!"
+fi
+
 exit $rc