fix version conflict, add curl to image

Author: jrabbit

Dockerfile

@@ -10,7 +10,7 @@ RUN apt-get update && apt-get install -y curl python2.7-minimal python-pip pytho
     curl -fSL 'https://bootstrap.pypa.io/get-pip.py' | python2 && \
     pip install --no-cache-dir -r /usr/src/redshirt/requirements.txt && \
     AUTO_ADDED_PACKAGES=`apt-mark showauto` && apt-get remove --purge -y $AUTO_ADDED_PACKAGES && \
-    apt-get install -y python2.7-minimal taskd gnutls-bin && \
+    apt-get install -y python2.7-minimal taskd gnutls-bin curl && \
     rm -rf /var/lib/apt/lists/*
 
 COPY . /usr/src/redshirt/

requirements.txt

@@ -5,5 +5,5 @@ mock==2.0.0
 pbr==1.10.0
 psutil==4.3.0
 six==1.10.0
-packaging==16.7
+packaging
 requests==2.10.0