Move boto3 to the backend base image

Dockerfile

-FROM registry.gitlab.com/arkindex/backend:base-0.9.6
+FROM registry.gitlab.com/arkindex/backend:base-0.10.1
 
 ARG COMMON_BRANCH=master
 ARG COMMON_ID=9855787

base/requirements.txt

+boto3==1.9
 cryptography>=2.7
 Django==2.2
 elasticsearch==6.2.0

requirements.txt

 # -r ./base/requirements.txt
 
 arkindex-common==0.2.0
-boto3==1.9
 certifi==2017.7.27.1
 chardet==3.0.4
 django-admin-hstore-widget==1.0.1