Adding kokoro config for windows (#1339)

* Adding kokoro config for php72 test on windows

* Get the right job name

* Stop using HOME because it's different when running the test

* Change directory before running the test

* Add windows configs for php versions

* Run self-update on composer

.kokoro/presubmit/windows/common.cfg

@@ -0,0 +1,9 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+build_file: "google-cloud-php/.kokoro/presubmit/windows/test.bat"
+
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.xml"
+  }
+}

.kokoro/presubmit/windows/php56.cfg

@@ -0,0 +1,3 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Intentionally empty

.kokoro/presubmit/windows/php70.cfg

@@ -0,0 +1,3 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Intentionally empty

.kokoro/presubmit/windows/php71.cfg

@@ -0,0 +1,3 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Intentionally empty

.kokoro/presubmit/windows/php72.cfg

@@ -0,0 +1,3 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Intentionally empty

.kokoro/presubmit/windows/php73.cfg

@@ -0,0 +1,3 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Intentionally empty

.kokoro/presubmit/windows/test.bat

@@ -0,0 +1,11 @@
+SET SHORT_JOB_NAME=%KOKORO_JOB_NAME:~-5%
+
+RENAME C:\Users\kbuilder\software\%SHORT_JOB_NAME% php
+
+CD github/google-cloud-php
+MKDIR %SHORT_JOB_NAME%\unit
+CALL php C:\Users\kbuilder\bin\composer self-update
+CALL php C:\Users\kbuilder\bin\composer update
+CALL vendor/bin/phpunit --log-junit %SHORT_JOB_NAME%\unit\sponge_log.xml
+
+RENAME C:\Users\kbuilder\software\php %SHORT_JOB_NAME%