Update dockers (#5186) (#5416)

- Remove ubuntu 14.04 and groovey file
- Remove all old fedora
- Update to Debian Stretch
- Remove rhel.6
	- No debian 9 1.x runtime support

Author: William Li

.vsts-ci.yml

@@ -88,13 +88,6 @@ stages:
       strategy:
         matrix:
           ${{ if or(eq(variables['System.TeamProject'], 'public'), in(variables['Build.Reason'], 'PullRequest')) }}:
-            Build_Ubuntu_14_04_Release_x64:
-              _BuildConfig: Release
-              _DockerParameter: '--docker ubuntu.14.04'
-              _LinuxPortable: ''
-              _RuntimeIdentifier: ''
-              _BuildArchitecture: 'x64'
-              _DropSuffix: ''
             Build_Ubuntu_16_04_Debug_x64:
               _BuildConfig: Debug
               _DockerParameter: '--docker ubuntu.16.04'
@@ -109,20 +102,6 @@ stages:
               _RuntimeIdentifier: ''
               _BuildArchitecture: 'x64'
               _DropSuffix: ''
-            Build_Fedora_27_Debug_x64:
-              _BuildConfig: Debug
-              _DockerParameter: '--docker fedora.27'
-              _LinuxPortable: '--linux-portable'
-              _RuntimeIdentifier: ''
-              _BuildArchitecture: 'x64'
-              _DropSuffix: ''
-            Build_Fedora_28_Debug_x64:
-              _BuildConfig: Debug
-              _DockerParameter: '--docker fedora.28'
-              _LinuxPortable: '--linux-portable'
-              _RuntimeIdentifier: ''
-              _BuildArchitecture: 'x64'
-              _DropSuffix: ''
             Build_Fedora_29_Debug_x64:
               _BuildConfig: Debug
               _DockerParameter: '--docker fedora.29'
@@ -137,7 +116,7 @@ stages:
               _RuntimeIdentifier: ''
               _BuildArchitecture: 'x64'
               _DropSuffix: ''
-            Build_Debian_Jessie_Debug_x64:
+            Build_Debian_Stretch_Debug_x64:
               _BuildConfig: Debug
               _DockerParameter: '--docker debian'
               _LinuxPortable: ''
@@ -151,13 +130,6 @@ stages:
               _RuntimeIdentifier: ''
               _BuildArchitecture: 'x64'
               _DropSuffix: ''
-            Build_Rhel_6_Debug_x64:
-              _BuildConfig: Debug
-              _DockerParameter: '--docker rhel.6'
-              _LinuxPortable: ''
-              _RuntimeIdentifier: '--runtime-id rhel.6-x64'
-              _BuildArchitecture: 'x64'
-              _DropSuffix: ''
             Build_Arm_Debug:
               _BuildConfig: Debug
               _DockerParameter: ''
@@ -208,13 +180,6 @@ stages:
               _RuntimeIdentifier: '--runtime-id linux-arm64'
               _BuildArchitecture: 'arm64'
               _DropSuffix: ''
-            Build_Rhel_6_Release_x64:
-              _BuildConfig: Release
-              _DockerParameter: '--docker rhel.6'
-              _LinuxPortable: ''
-              _RuntimeIdentifier: '--runtime-id rhel.6-x64'
-              _BuildArchitecture: 'x64'
-              _DropSuffix: ''
             Build_Linux_musl_Release_x64:
               _BuildConfig: Release
               _DockerParameter: '--docker alpine.3.6'

eng/docker/debian/Dockerfile

@@ -4,7 +4,21 @@
 #
 
 # Dockerfile that creates a container suitable to build dotnet-cli
-FROM mcr.microsoft.com/dotnet-buildtools/prereqs:debian-jessie-debpkg-58e4974-20190328133153
+FROM mcr.microsoft.com/dotnet-buildtools/prereqs:debian-stretch-d61254f-20190807161114
+
+# Install the deb packaging toolchain we need to build debs
+RUN apt-get update \
+    && apt-get -y install \
+        debhelper \
+        build-essential \
+        devscripts \
+        locales \
+    && rm -rf /var/lib/apt/lists/*
+
+# liblldb is needed so deb package build does not throw missing library info errors
+RUN apt-get update \
+    && apt-get -y install liblldb-3.9 \
+    && rm -rf /var/lib/apt/lists/*
 
 # Misc Dependencies for build
 RUN rm -rf /var/lib/apt/lists/* && \
@@ -13,6 +27,8 @@ RUN rm -rf /var/lib/apt/lists/* && \
         sudo && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
+    
+RUN localedef -c -i en_US -f UTF-8 en_US.UTF-8
 
 # Setup User to match Host User, and give superuser permissions
 ARG USER_ID=0