Added infer and minor cleanup

docker/code-analysis/Dockerfile

@@ -236,13 +236,10 @@ RUN \
     ln -sf /usr/lib/libmicroxml.so.1.0 /lib/libmicroxml.so.1
 
 # Download the Infer release
-RUN INFER_VERSION=v1.2.0; \
-    cd /opt && \
-    curl -sL \
-      https://github.com/facebook/infer/releases/download/${INFER_VERSION}/infer-linux-x86_64-${INFER_VERSION}.tar.xz | \
-    tar xJ && \
-    rm -f /infer && \
-    ln -s ${PWD}/infer-linux-x86_64-$INFER_VERSION /infer
+ARG INFER_VERSION=v1.2.0
+RUN cd /opt/dev && \
+    curl -sL https://github.com/facebook/infer/releases/download/${INFER_VERSION}/infer-linux-x86_64-${INFER_VERSION}.tar.xz | tar xJ && \
+    mv /opt/dev/infer-linux-x86_64-$INFER_VERSION /infer
 
 # Install infer
 ENV PATH /infer/bin:${PATH}