CC-4989: upgrade to mutagen 1.21

-done

python_apps/python-virtualenv/requirements

@@ -8,5 +8,5 @@ poster==0.8.1
 pytz==2011k
 wsgiref==0.1.2
 configobj==4.7.2
-mutagen==1.20
+mutagen==1.21
 docopt==0.4.2

python_apps/python-virtualenv/virtualenv-install.sh

@@ -50,18 +50,3 @@ fi
 
 echo -e "\n*** Installing Python Libraries ***"
 /usr/lib/airtime/airtime_virtualenv/bin/pip install ${SCRIPTPATH}/airtime_virtual_env.pybundle || exit 1
-
-PYTHON_VERSION=$(python -c "import sys; print 'python%s.%s' % (sys.version_info[0], sys.version_info[1])")
-
-echo -e "\n*** Patching Python Libraries ***"
-echo " * Patching virtualenv libraries in /usr/lib/airtime/airtime_virtualenv/lib/$PYTHON_VERSION"
-PATCHES=${SCRIPTPATH}/patches/*
-for file in $(find $PATCHES -print); do
-if [ -d $file ]; then
-    DIRNAME=$(basename $file)
-    echo -e "\n   ---Applying Patches for $DIRNAME---"
-else
-    patch -N -p7 -i $file -d /usr/lib/airtime/airtime_virtualenv/lib/$PYTHON_VERSION
-fi
-done
-exit 0