2016.3.4: python-futures not installed on CentOS7 when using bootstrap install

[frogunder]

When installing salt on a centos7 machine using the bootstrap script, futures does not get installed.

See issue: #917

When installing salt on a ubuntu14 machine using bootstrap, futures gets installed.

[root@li511-30 ~]# sh bootstrap.sh -v
bootstrap.sh -- Version 2016.08.16
[root@li511-30 ~]# 

[root@li511-30 ~]# pip list | grep -i futures
[root@li511-30 ~]# 

[root@li511-30 ~]# salt --versions
Salt Version:
           Salt: 2016.3.4

Dependency Versions:
           cffi: Not Installed
       cherrypy: Not Installed
       dateutil: Not Installed
          gitdb: Not Installed
      gitpython: Not Installed
          ioflo: Not Installed
         Jinja2: 2.7.2
        libgit2: Not Installed
        libnacl: Not Installed
       M2Crypto: 0.21.1
           Mako: Not Installed
   msgpack-pure: Not Installed
 msgpack-python: 0.4.8
   mysql-python: Not Installed
      pycparser: Not Installed
       pycrypto: 2.6.1
         pygit2: Not Installed
         Python: 2.7.5 (default, Jun 17 2014, 18:11:42)
   python-gnupg: Not Installed
         PyYAML: 3.11
          PyZMQ: 15.3.0
           RAET: Not Installed
          smmap: Not Installed
        timelib: Not Installed
        Tornado: 4.2.1
            ZMQ: 4.1.4

System Versions:
           dist: centos 7.0.1406 Core
        machine: x86_64
        release: 4.8.3-x86_64-linode76
         system: Linux
        version: CentOS Linux 7.0.1406 Core

[root@li511-30 ~]# 

[rallytime]

This is already fixed with #948.