build: make instal-apt-ci.sh easier to synchronize with .travis.xml

Tools/scripts/install-apt-ci.sh

@@ -3,9 +3,22 @@
 
 set -ex
 
-PKGS="build-essential gawk ccache genromfs libc6-i386 \
-      libxml2-dev libxslt1-dev python-dev python-pip zlib1g-dev \
-      gcc-4.9 g++-4.9 cmake cmake-data" # clang-3.7 llvm-3.7"
+PKGS=" \
+    build-essential \
+    gawk \
+    ccache \
+    genromfs \
+    libc6-i386 \
+    libxml2-dev \
+    libxslt1-dev \
+    python-pip \
+    python-dev \
+    zlib1g-dev \
+    gcc-4.9 \
+    g++-4.9 \
+    cmake \
+    cmake-data \
+    "
 
 read -r UBUNTU_CODENAME <<<$(lsb_release -c -s)