add sophos and mcafee scan backend

MalwareMultiScan.Backends/Dockerfiles/McAfee.Dockerfile

@@ -0,0 +1,19 @@
+FROM mindcollapse/malware-multi-scan-worker:latest
+
+RUN apt-get update && apt-get install unzip wget -y
+
+WORKDIR /tmp
+
+RUN wget -q http://b2b-download.mcafee.com/products/evaluation/vcl/l64/vscl-l64-604-e.tar.gz && \
+    mkdir -p /usr/local/uvscan && \
+    tar -xzf vscl-l64-604-e.tar.gz -C /usr/local/uvscan
+    
+RUN wget -q -Nc -r -nd -l1 -A "avvepo????dat.zip" http://download.nai.com/products/DatFiles/4.x/nai/ && \
+    for avvepo in `ls avvepo*`; do unzip -o $avvepo; done && \
+    for avvdat in `ls avvdat-*`; do unzip -o $avvdat -d /usr/local/uvscan; done && \
+    /usr/local/uvscan/uvscan --decompress && \
+    rm -rf /tmp/*
+
+WORKDIR /worker
+
+ENV BackendType=McAfee