fix(client): update PyInstaller to package requests lib properly

The versions of the deis CLI created by "make -C client/ build"
were using PyInstaller 2.1, the current release. This updates
PyInstaller used for packaging to a current SHA, which includes
a hook script for the python requests library to package its
data files correctly.

Author: mboersma

dev_requirements.txt

@@ -5,7 +5,7 @@ requests==2.4.3
 termcolor==1.1.0
 
 # PyInstaller builds client binaries
-PyInstaller==2.1
+git+https://github.com/pyinstaller/pyinstaller@7413317
 
 # Deis documentation requirements
 Sphinx>=1.2.3