tests: add CLI tests for version output (#664)

internal/tests/cli/boundary/_version.bash

@@ -0,0 +1,19 @@
+function version() {
+  boundary version -format json
+}
+
+function version_is_valid() {
+  ver=$($(strip version) | jq -c '.version' | cut -d 'v' -f2)
+  if [ "$ver" == "null" ]; then
+    return 1
+  fi
+  return 0 
+}
+
+function revision_is_valid() {
+  len=$($(strip version) | jq -c '.revision' | cut -d '+' -f1 | wc -m)
+  if [ "$len" -eq 42 ]; then
+    return 0
+  fi
+  return 1
+}