Move PHP version tests to the top

Author: alcaeus

.evergreen/config.yml

@@ -543,7 +543,7 @@ buildvariants:
     - { "os-php7": "rhel71-power8", "php-versions": "*", edge-versions: "*", "driver-versions": "*" }
     # rhel74-zseries doesn't start in a timely fashion - most likely missing executors
     - { "os-php7": "rhel74-zseries", "php-versions": "*", edge-versions: "*", "driver-versions": "*" }
-  display_name: "${os-php7}, PHP ${php-versions}, MongoDB ${edge-versions}, ext-mongodb ${driver-versions}"
+  display_name: "* ${os-php7}, PHP ${php-versions}, MongoDB ${edge-versions}, ext-mongodb ${driver-versions}"
   tasks:
     - name: "test-standalone"
     - name: "test-replica_set"