fix(deisctl): prevent build on windows

On windows the deisctl client will build, but it runs into a lot of
problems at runtime due to limitations in fleetctl. It depends on the
ssh-agent domain socket which cannot exist in windows as windows does
not support the idea of domain sockets.

This will prevent issues at runtime at the expense of being able to
build and run deisctl in windows.
fix(gateway): wait until radosgw is accessible
docs(contrib): Clarify source of DEV_REGISTRY IP Address
fix(builder): the value could be a number
chore(release): update version in master to 1.2.0-dev
feat(vagrant): check for discovery url
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.
Merge pull request #2607 from Xe/fix/deisctl/prevent-build-on-windows

fix(deisctl): prevent build on windows
Merge pull request #2618 from Joshua-Anderson/doc_hacking_fix

docs(contrib): Clarify source of DEV_REGISTRY IP Address
Merge pull request #2602 from aledbf/check_discovery-url

feat(vagrant): check if discovery url is defined
Merge pull request #2675 from aledbf/add_wait_to_gateway

fix(gateway): wait until radosgw is accessible
Merge pull request #2721 from mboersma/fix-pyinstaller-ssl

fix(client): update PyInstaller to package requests lib properly
Merge pull request #2707 from aledbf/config_accept_any_type

fix(builder): the value of a variable could be a number