use flags to resolve the unsafe and cache problems

requirements/README.md

@@ -1,8 +1,5 @@
 The requirements.txt and requirements_ansible.txt files are generated from requirements.in and requirements_ansible.in, respectively, using `pip-tools` `pip-compile`. The following commands should do this if ran inside the tools_awx container.
 
-At the end of both `.in` files, pip and setuptools need to have their versions pinned.
-After producing the `.txt` files, the versions need to be manually added back at the end.
-
 Run these commands from the root of the awx repo. This will produce python 3 requirements files.
 
 ```
@@ -11,8 +8,8 @@ source /buildit/bin/activate
 pip install pip-tools
 pip install pip --upgrade
 
-pip-compile -U --output-file requirements/requirements.txt requirements/requirements.in
-pip-compile -U --output-file requirements/requirements_ansible_py3.txt requirements/requirements_ansible.in
+pip-compile -U -r --allow-unsafe --output-file requirements/requirements.txt requirements/requirements.in
+pip-compile -U -r --allow-unsafe --output-file requirements/requirements_ansible_py3.txt requirements/requirements_ansible.in
 ```
 
 The Ansible venv requirements file needs to start with the python 2 version
@@ -25,17 +22,14 @@ source /buildit_py2/bin/activate
 pip install pip-tools
 pip install pip --upgrade
 
-pip-compile -U --output-file requirements/requirements_ansible.txt requirements/requirements_ansible.in
+pip-compile -U -r --allow-unsafe --output-file requirements/requirements_ansible.txt requirements/requirements_ansible.in
 diff requirements/requirements_ansible_py3.txt requirements/requirements_ansible.txt
 rm requirements/requirements_ansible_py3.txt
 ```
 
 Python 3 exceptions should be added to relevant `requirements_ansible.txt` lines
 after version numbers with the syntax of `; python_version < '3'`.
 
-If running the `pip-compile` command multiple times, and you see warnings that
-cache entry deserialization has failed, then `rm -rf ~/.cache/pip` and re-run the command.
-
 ## Licenses and Source Files
 
 If any library has a change to its license with the upgrade, then the license for that library

requirements/requirements.txt

@@ -2,7 +2,7 @@
 # This file is autogenerated by pip-compile
 # To update, run:
 #
-#    pip-compile -U --output-file requirements/requirements.txt requirements/requirements.in
+#    pip-compile -U -r --allow-unsafe --output-file requirements/requirements.txt requirements/requirements.in
 #
 adal==1.2.1               # via msrestazure
 amqp==2.4.2               # via kombu

requirements/requirements_ansible.txt

@@ -2,7 +2,7 @@
 # This file is autogenerated by pip-compile
 # To update, run:
 #
-#    pip-compile -U --output-file requirements/requirements_ansible.txt requirements/requirements_ansible.in
+#    pip-compile -U -r --allow-unsafe --output-file requirements/requirements_ansible.txt requirements/requirements_ansible.in
 #
 adal==1.2.1               # via msrestazure
 appdirs==1.4.3            # via openstacksdk