Support of an alternate pypi server

Currently pip will get the package from the https://pypi.python.org server.
For CI, it's a problem as Internet connection can be down,
the pypi server down, etc...

The usecase is for a company/user that maintain a local pypi mirror
and give the option to use this server instead of the official one

Change-Id: I83aac4646cb78827a92c9636d78238f8a6118642
Implements: blueprint support-local-pypi-server
Add architecture to tempest configuration

Cirros may be also built in other architectures other than
x86_64 (ex: ppc). This option should be broader,
so adding a new variable CIRROS_ARCH

Change-Id: I9fcd3f15e04bb581cf647ad49172c7d698e8e574
Fix cinder volume type creation and rename variable

Commit 7062b12b9b91a1eb405d7079c62b62b0de59109f introduced
a bug where the default_volume_type is set to 'lvm' but
that is not the volume-type that's actually created, that
is 'lvmdriver-1' in gate runs, so we see a ton of
VolumeTypeNotFoundByName for the 'lvm' volume type in the
cinder-api logs.

This simply sets the default_volume_type to the volume
type that's created in the create_volume_types function.

Also renames the default_type variable to default_name to
be consistent with variable naming in the rest of the
cinder script.

Change-Id: Ib35ffc09f6582354010ac8ca35da581ea508877a
Closes-Bug: #1348786
Merge "Support of an alternate pypi server"
Merge "Fix cinder volume type creation and rename variable"
Merge "Add architecture to tempest configuration"