Install dependencies in a temporary directory

Doing the dependency installation in a temporary directory prevents the
pollution of the current working directory.

BUILD/install_build_deps.sh

@@ -3,6 +3,10 @@
 # Do the real building work. This script is executed on build VM and
 # requires a working installation of CMake.
 
+# Build in a temp directory so we don't pollute cwd
+tmpdir=$(mktemp -d)
+
+cd $tmpdir
 
 command -v apt-get
 
@@ -135,6 +139,7 @@ git clone https://github.com/alanxz/rabbitmq-c.git
 if [ $? != 0 ]
 then
     echo "Error cloning rabbitmq-c"
+    rm -rf $tmpdir
     exit 1
 fi
 
@@ -152,6 +157,7 @@ wget -q --no-check-certificate http://prdownloads.sourceforge.net/tcl/tcl8.6.5-s
 if [ $? != 0 ]
 then
     echo "Error getting tcl"
+    rm -rf $tmpdir
     exit 1
 fi
 
@@ -167,6 +173,7 @@ git clone https://github.com/akheron/jansson.git
 if [ $? != 0 ]
 then
     echo "Error cloning jansson"
+    rm -rf $tmpdir
     exit 1
 fi
 
@@ -184,6 +191,7 @@ wget -q -r -l1 -nH --cut-dirs=2 --no-parent -A.tar.gz --no-directories http://mi
 if [ $? != 0 ]
 then
     echo "Error getting avro-c"
+    rm -rf $tmpdir
     exit 1
 fi
 avro_filename=`ls -1 avro*.tar.gz`
@@ -200,3 +208,5 @@ popd
 wget --quiet https://nodejs.org/dist/v6.11.2/node-v6.11.2-linux-x64.tar.xz
 tar -axf node-v6.11.2-linux-x64.tar.xz
 sudo cp -t /usr -r node-v6.11.2-linux-x64/*
+
+rm -rf $tmpdir