updated buildserver provisions to stretch

buildserver/provision-apt-get-install

@@ -22,8 +22,8 @@ fi
 
 sed -i "s,http://ftp.uk.debian.org/debian/,${debian_mirror},g" /etc/apt/sources.list
 
-if grep --quiet jessie /etc/apt/sources.list; then
-    echo "deb $debian_mirror jessie-backports main" > /etc/apt/sources.list.d/backports.list
+if grep --quiet stretch /etc/apt/sources.list; then
+    echo "deb $debian_mirror stretch-backports main" > /etc/apt/sources.list.d/stretch-backports.list
     echo "deb $debian_mirror testing main" > /etc/apt/sources.list.d/testing.list
     printf "Package: *\nPin: release o=Debian,a=testing\nPin-Priority: -300\n" > /etc/apt/preferences.d/debian-testing
 fi
@@ -45,16 +45,16 @@ packages="
  autopoint
  bison
  bzr
- ca-certificates-java/jessie-backports
- cmake/jessie-backports
+ ca-certificates-java
+ cmake
  curl
  expect
  faketime
  flex
- gettext/jessie-backports
- gettext-base/jessie-backports
- git-core/jessie-backports
- git-svn/jessie-backports
+ gettext
+ gettext-base
+ git-core
+ git-svn
  gperf
  graphviz
  imagemagick
@@ -75,7 +75,7 @@ packages="
  libtool-bin/testing
  make
  maven
- mercurial/jessie-backports
+ mercurial
  nasm
  nodejs
  openjdk-8-jre-headless
@@ -90,13 +90,13 @@ packages="
  python-magic
  python-setuptools
  python3-defusedxml
- python3-git/jessie-backports
- python3-gitdb/jessie-backports
+ python3-git
+ python3-gitdb
  python3-gnupg
  python3-pyasn1
  python3-pyasn1-modules
  python3-requests
- python3-smmap/jessie-backports
+ python3-smmap
  python3-yaml
  python3-ruamel.yaml
  quilt