Release notes: correctly strip out none, n/a, no

The previous regex was only matching lines and was not even correctly
doing so. We no match everything that is starting with none, n/a or
no as a sentence or as a full line. We also match empty string and
'.' as a full line.

RELNOTES: .
RELNOTES: None.
RELNOTES: No.

Change-Id: I6e85627170ce35e652c90a37e735b7db93c88b4e
PiperOrigin-RevId: 172452278

scripts/release/relnotes.sh

@@ -88,7 +88,7 @@ function extract_release_note() {
   if [[ "$relnote" =~ $regex ]]; then
       local relnote_kind=${BASH_REMATCH[2]}
       local relnote_text="${BASH_REMATCH[3]}"
-      if [[ ! "$(echo $relnote_text | awk '{print tolower($0)}')" =~ ^(none|n/a|no[ \.])?.?$ ]]; then
+      if [[ ! "$(echo $relnote_text | awk '{print tolower($0)}')" =~ ^((none|n/a|no)(\.( .*)?)?|\.)$ ]]; then
         eval "RELNOTES_${relnote_kind}+=(\"\${relnote_text}\")"
       fi
   fi

scripts/release/relnotes_test.sh

@@ -251,4 +251,17 @@ a9c46e5907be66248b6218ae70e0a1d999c696d5
   assert_equals "${expected}" "${actual}"
 }
 
+function test_nonone_relnotes() {
+  git checkout -q 2ea4fa26281175c316651ec50784b820a9f409cf
+  local expected='Incompatible changes:
+
+  - --javabase=<absolute path> and --host_javabase=<absolute path>
+    are not supported anymore. If you need this functionality
+    java_runtime_suite(name="suite", default=":runtime")
+    java_runtime(name="runtime", java_home=<path to the JDK>) is an
+    alternative.'
+  local actual="$(release_notes  7c605cf6ea9755a06e5abb16a631faac8ebe2937)"
+  assert_equals "${expected}" "${actual}"
+}
+
 run_suite "Release notes generation tests"