Add Bazelisk support to Linux and Windows (#490)

* added bazelisk

* moved bazelisk installation to bazel

* changed Validate-Bazel.ps1

* removed Install-Bazelisk.ps1

* changed bazel and bazelisk version output

* fixed Validate-Bazel.ps1

* removed the extra "$" character

images/win/Windows2016-Azure.json

@@ -277,6 +277,12 @@
                 "{{ template_dir }}/scripts/Installers/Install-NodeLts.ps1"
             ]
         },
+        {
+            "type": "powershell",
+            "scripts":[
+                "{{ template_dir }}/scripts/Installers/Install-Bazel.ps1"
+            ]
+        },
         {
             "type": "powershell",
             "scripts":[
@@ -576,12 +582,6 @@
                 "{{ template_dir }}/scripts/Installers/Install-Kind.ps1"
             ]
         },
-        {
-            "type": "powershell",
-            "scripts":[
-                "{{ template_dir }}/scripts/Installers/Install-Bazel.ps1"
-            ]
-        },
         {
             "type": "windows-restart",
             "restart_timeout": "30m"
@@ -717,6 +717,12 @@
                 "{{ template_dir }}/scripts/Installers/Validate-NodeLts.ps1"
             ]
         },
+        {
+            "type": "powershell",
+            "scripts":[
+                "{{ template_dir }}/scripts/Installers/Validate-Bazel.ps1"
+            ]
+        },
         {
             "type": "powershell",
             "scripts":[
@@ -861,12 +867,6 @@
                 "{{ template_dir }}/scripts/Installers/Validate-Kind.ps1"
             ]
         },
-        {
-            "type": "powershell",
-            "scripts":[
-                "{{ template_dir }}/scripts/Installers/Validate-Bazel.ps1"
-            ]
-        },
         {
             "type": "file",
             "source": "C:\\InstalledSoftware.md",