chore(java_templates): add default CODEOWNERS files for samples reviews (#152)

This should automatically request reviews from the googleapis/java-samples-reviewers team for changes to samples Java code.

If you provide a `codeowner_team` in the `.repo-metadata.json` configuration file, it also adds an entry for any Java code. Note that later entries in the file take precedence over earlier ones so samples Java code will only require reviews by the samples team.

Source-Author: Jeff Ching <chingor@google.com>
Source-Date: Wed Jun 3 15:32:11 2020 -0700
Source-Repo: googleapis/synthtool
Source-Sha: 8b65daa222d193b689279162781baf0aa1f0ffd2
Source-Link: googleapis/synthtool@8b65daa

Author: yoshi-automation

.github/CODEOWNERS

@@ -1,10 +1,8 @@
 # Code owners file.
 # This file controls who is tagged for review for any given pull request.
-#
+
 # For syntax help see:
 # https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners#codeowners-syntax
 
-
-# The firestore-dpe team is the default owner for anything not
-# explicitly taken by someone else.
-*                               @googleapis/firestore-dpe
+# The java-samples-reviewers team is the default owner for samples changes
+samples/**/*.java       @googleapis/java-samples-reviewers

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-datastore.git",
-        "sha": "660f216302fedaf2f5fe0f4c76cdab8fca65cbd1"
+        "sha": "d572efb1d8367086d2062c3a2f2c0ae61b85abf8"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "5b48b0716a36ca069db3038da7e205c87a22ed19"
+        "sha": "8b65daa222d193b689279162781baf0aa1f0ffd2"
       }
     }
   ],