When pip is run outside of venv, don't show the upgrade warning

This is a fix for https://bugzilla.redhat.com/show_bug.cgi?id=1573755

1. We put "rpm" inside pip's INSTALLER instead of "pip"

2. From pip, we check what's in INSTALLER and only show the warning
   if it's "pip".

When a venv is cearted, pip is installed from wheel (trough rewheel),
INSTALLER contains "pip".

When virtualenv is used, pip is installed from the Interwebz via pip,
so INSTALLER contains "pip".

Upstream issue https://github.com/pypa/pip/issues/5346

python-pip.spec

@@ -44,6 +44,11 @@ Patch0:         allow-stripping-given-prefix-from-wheel-RECORD-files.patch
 # Issue upstream: https://github.com/pypa/pip/issues/4288
 Patch1:         emit-a-warning-when-running-with-root-privileges.patch
 
+
+# WIP upstream patch https://github.com/pypa/pip/issues/5346
+# https://bugzilla.redhat.com/show_bug.cgi?id=1573755
+Patch2:         pip-nowarn-upgrade.patch
+
 # Downstream only patch
 # Users are upgrading pip9 to pip10 by various manners,
 # one of them is `pip install --user --upgrade pip`.
@@ -186,6 +191,7 @@ tar -xf %{SOURCE1}
 
 %patch0 -p1
 %patch1 -p1
+%patch2 -p1
 
 sed -i '1d' pip/__init__.py
 
@@ -276,6 +282,12 @@ ln -s ./pip%{python3_version} %{buildroot}%{_bindir}/pip-%{python3_version}
 ln -s ./pip-%{python2_version} %{buildroot}%{_bindir}/pip-2
 ln -s ./pip-%{python3_version} %{buildroot}%{_bindir}/pip-3
 
+# Make sure the INSTALLER is not pip, otherwise Patch2 won't work
+# TODO Maybe we should make all our python packages have this?
+echo rpm > %{buildroot}%{python2_sitelib}/pip-%{version}.dist-info/INSTALLER
+%if 0%{?with_python3}
+echo rpm > %{buildroot}%{python3_sitelib}/pip-%{version}.dist-info/INSTALLER
+%endif
 
 %if 0%{?with_tests}
 %check
@@ -320,8 +332,10 @@ py.test-%{python3_version} -m 'not network'
 %changelog
 * Fri May 04 2018 Miro Hrončok <mhroncok@redhat.com> - 9.0.3-2
 - Allow to import pip10's main from pip9's /usr/bin/pip
+- Do not show the "new version of pip" warning outside of venv
 Resolves: rhbz#1569488
 Resolves: rhbz#1571650
+Resolves: rhbz#1573755
 
 * Thu Mar 29 2018 Charalampos Stratakis <cstratak@redhat.com> - 9.0.3-1
 - Update to 9.0.3