depend on version 2 of docker-py

which is now available as 'docker' in PyPI and as a `python{2,3}-docker`
in Fedora.

Signed-off-by: Tomas Tomecek <ttomecek@redhat.com>

Closes: #902
Approved by: rhatdan

.papr.Dockerfile

@@ -16,7 +16,7 @@ RUN dnf install -y \
         python-dbus \
         pylint \
         python-slip-dbus \
-        python-docker-py \
+        python2-docker \
         python2-dateutil \
         PyYAML \
         rpm-python \

.papr.sh

@@ -62,7 +62,7 @@ dnf install -y \
     python-dbus \
     pylint \
     python-slip-dbus \
-    python-docker-py \
+    python2-docker \
     python2-dateutil \
     PyYAML \
     rpm-python \

docs/install/Fedora.md

@@ -15,11 +15,11 @@ dnf install atomic
 On Fedora, You need to install required build dependencies
 ```
 yum-builddep atomic
-yum install -y python-requests libselinux-python python-docker-py \
+yum install -y python-requests libselinux-python python3-docker \
     python-dateutil python-yaml pylint python-slip-dbus python-gobject
 # or
 dnf builddep atomic
-dnf install -y python-requests libselinux-python python-docker-py \
+dnf install -y python-requests libselinux-python python3-docker \
     python-dateutil python-yaml pylint python-slip-dbus python-gobject
 ```
 

requirements.txt

@@ -1,6 +1,6 @@
 requests>=2.4.3
 setuptools
-docker-py
+docker
 websocket-client>=0.11.0
 six>=1.3.0
 xattr