php: remove hardcoded version in templates

templates/composer.json.template

+%YAML 1.2
+--- |
+  {
+    "name": "grpc/grpc",
+    "type": "library",
+    "description": "gRPC library for PHP",
+    "version": "${settings.php_version.php()}",
+    "keywords": ["rpc"],
+    "homepage": "http://grpc.io",
+    "license": "BSD-3-Clause",
+    "repositories": [
+      {
+        "type": "vcs",
+        "url": "https://github.com/stanley-cheung/Protobuf-PHP"
+      }
+    ],
+    "require": {
+      "php": ">=5.5.0",
+      "datto/protobuf-php": "dev-master",
+      "google/auth": "v0.7"
+    },
+    "autoload": {
+      "psr-4": {
+        "Grpc\\": "src/php/lib/Grpc/"
+      }
+    }
+  }

templates/package.xml.template

@@ -15,8 +15,8 @@
    <date>2016-03-01</date>
    <time>16:06:07</time>
    <version>
-    <release>0.14.0</release>
-    <api>0.14.0</api>
+    <release>${settings.php_version.php()}</release>
+    <api>${settings.php_version.php()}</api>
    </version>
    <stability>
     <release>beta</release>
@@ -157,8 +157,8 @@
     </release>
     <release>
      <version>
-      <release>0.14.0</release>
-      <api>0.14.0</api>
+      <release>${settings.php_version.php()}</release>
+      <api>${settings.php_version.php()}</api>
      </version>
      <stability>
       <release>beta</release>

tools/buildgen/plugins/expand_version.py

@@ -84,6 +84,11 @@ class Version:
     else:
       return '%d.%d.%d' % (self.major, self.minor, self.patch)
 
+  def php(self):
+    """Version string in PHP style"""
+    """PECL does not allow tag in version string"""
+    return '%d.%d.%d' % (self.major, self.minor, self.patch)
+
 def mako_plugin(dictionary):
   """Expand version numbers:
      - for each language, ensure there's a language_version tag in