Upgrading image builder to latest

build-pipeline/dotnet-docker-linux-amd64-images.json

@@ -122,7 +122,7 @@
       "allowOverride": true
     },
     "image-builder.imageName": {
-      "value": "microsoft/dotnet-buildtools-prereqs:image-builder-jessie-20170804090915"
+      "value": "microsoft/dotnet-buildtools-prereqs:image-builder-jessie-20170807101136"
     },
     "image-builder.args": {
       "value": "build --manifest manifest.json --repo microsoft/dotnet-nightly --path $(PB.image-builder.path) --test-var Filter=$(PB.image-builder.path) --test-var Architecture=amd64 --push --username $(PB.docker.username) --password $(PB.docker.password) $(PB.image-builder.customCommonArgs)",

build-pipeline/dotnet-docker-linux-arm32v7-images.json

@@ -176,7 +176,7 @@
       "value": "$(Build.DefinitionName)-$(Build.BuildId)"
     },
     "image-builder.imageName": {
-      "value": "microsoft/dotnet-buildtools-prereqs:image-builder-jessie-20170804090915"
+      "value": "microsoft/dotnet-buildtools-prereqs:image-builder-jessie-20170807101136"
     },
     "image-builder.args": {
       "value": "build --manifest manifest.json --repo microsoft/dotnet-nightly --path $(PB.image-builder.path) --architecture arm --test-var Filter=$(PB.image-builder.path) --test-var Architecture=arm --push --username $(PB.docker.username) --password $(PB.docker.password) $(PB.image-builder.customCommonArgs)",

build-pipeline/dotnet-docker-post-image-build.json

@@ -141,7 +141,7 @@
       "allowOverride": true
     },
     "image-builder.imageName": {
-      "value": "microsoft/dotnet-buildtools-prereqs:image-builder-jessie-20170804090915"
+      "value": "microsoft/dotnet-buildtools-prereqs:image-builder-jessie-20170807101136"
     },
     "image-builder.common.args": {
       "value": "--manifest manifest.json --repo microsoft/dotnet-nightly --username $(PB.docker.username) --password $(PB.docker.password) $(PB.image-builder.customCommonArgs)",

build-pipeline/dotnet-docker-windows-amd64-images.json

@@ -183,7 +183,7 @@
       "allowOverride": true
     },
     "image-builder.imageName": {
-      "value": "microsoft/dotnet-buildtools-prereqs:image-builder-nanoserver-20170804091402"
+      "value": "microsoft/dotnet-buildtools-prereqs:image-builder-nanoserver-20170807101134"
     },
     "image-builder.args": {
       "value": "build --manifest manifest.json --repo microsoft/dotnet-nightly --path $(PB.image-builder.path) --test-var Filter=$(PB.image-builder.path) --test-var Architecture=amd64 --push --username $(PB.docker.username) --password $(PB.docker.password) $(PB.image-builder.customCommonArgs)",