Update known good apache2 targets. (#7067)

tests/letstest/apache2_targets.yaml

@@ -1,13 +1,18 @@
 targets:
   #-----------------------------------------------------------------------------
-  # Apache 2.4
-  - ami: ami-26d5af4c
-    name: ubuntu15.10
+  #Ubuntu
+  - ami: ami-064bd2d44a1d6c097
+    name: ubuntu18.10
     type: ubuntu
     virt: hvm
     user: ubuntu
-  - ami: ami-d92e6bb3
-    name: ubuntu15.04LTS
+  - ami: ami-012fd5eb46f56731f
+    name: ubuntu18.04LTS
+    type: ubuntu
+    virt: hvm
+    user: ubuntu
+  - ami: ami-09677e0a6b14905b0
+    name: ubuntu16.04LTS
     type: ubuntu
     virt: hvm
     user: ubuntu
@@ -21,37 +26,29 @@ targets:
     type: ubuntu
     virt: pv
     user: ubuntu
-  - ami: ami-116d857a
-    name: debian8.1
-    type: debian
+  #-----------------------------------------------------------------------------
+  # Debian
+  - ami: ami-003f19e0e687de1cd
+    name: debian9
+    type: ubuntu
+    virt: hvm
+    user: admin
+  - ami: ami-077bf3962f29d3fa4
+    name: debian8.1
+    type: ubuntu
     virt: hvm
     user: admin
-    userdata: |
-      #cloud-init
-      runcmd:
-        - [ apt-get, install, -y, curl ]
   #-----------------------------------------------------------------------------
-  # Apache 2.2
-  # - ami: ami-0611546c
-  #   name: ubuntu12.04LTS
-  #   type: ubuntu
-  #   virt: hvm
-  #   user: ubuntu
-  # - ami: ami-e0efab88
-  #   name: debian7.8.aws.1
-  #   type: debian
-  #   virt: hvm
-  #   user: admin
-  #   userdata: |
-  #     #cloud-init
-  #     runcmd:
-  #       - [ apt-get, install, -y, curl ]
-  # - ami: ami-e6eeaa8e
-  #   name: debian7.8.aws.1_32bit
-  #   type: debian
-  #   virt: pv
-  #   user: admin
-  #   userdata: |
-  #     #cloud-init
-  #     runcmd:
-  #       - [ apt-get, install, -y, curl ]
+  # Fedora
+  - ami: ami-5c69df23
+    name: fedora28
+    type: centos
+    virt: hvm
+    user: fedora
+  #-----------------------------------------------------------------------------
+  # CentOS
+  - ami: ami-9887c6e7
+    name: centos7
+    type: centos
+    virt: hvm
+    user: centos