dpkg: support pkg-map in bin/install-packages

Updates the dpkg element's bin/install-packages script
so that if supports using pkg-map for package mapping.
To make use of the new change simply add the -m <element name>
to allow install-packages to know which element namespace to use
when installing packages.

Use of the new -m option is off by default.

As part of this change we also updated install-packages
to use getopt for in script argument parsing.

Change-Id: Idfc40f2d75828a0f09d227f0332ccef8f0183efc
opensuse: support pkg-map in bin/install-packages

Updates the opensuse element's bin/install-packages script
so that if supports using pkg-map instead of map-packages
for package mapping. To make use of the new change
simply add the -m <element name> to allow install-packages
to know which element namespace to use when installing packages.

Use of the new -m option is off by default.

As part of this change we also updated install-packages
to use getopt for in script argument parsing.

Change-Id: I56da8adf6c445c50c7642e221c6c11ba59330404
Update base element to make use of pkg-map

With this change package name to distro mappings used
within the base element are now stored in the top
level pkg-map file.

Additionally, all bin/install-packages commands are updated
to use the -m option so that the base element pkg-map
namespace is used by default.

Change-Id: I3bdbf987c8525f9ef67ca0c263651d6613f29ef0
Disk-image-create should allow sending compat flags to qemu-img

Add a --options flag that allows disk-image-create to send custom
options to qemu-img calls. It is useful for forcing compat into
qemu-img created images.

Usage:
    disk-image-create --qemu-img-options compat=0.10 base ubuntu

Change-Id: I73ee2c86abc115220d51ffebbbe9ce3c4d92f188
Closes-Bug: #1329746
Always bind-mount pypi mirror if dir exists

It may be desirable to specify file://tmp/pypi as one of the list
of mirrors specified by PYPI_MIRROR_URL, so the local pypi mirror
should be mounted as long as the directory exists.

Even though the path is mounted, it is only used by pip if there is
no specified PYPI_MIRROR_URL, or if one PYPI_MIRROR_URL entry
specifies file://tmp/pypi.

The pypi element previously assumed that a local mirror would be
a complete offline mirror. This change allows for a mixture of
local mirror plus remote mirrors. This means that the local
mirror could (for example) contain a few locally built pip packages
from arbitrary git checkouts for gate testing of those projects.
In this scenario, most packages would be downloaded from the
configured remote mirrors.

This change is required for synchronous gating on the os-*-config
tools.

Change-Id: I0f6d153c06993ffd0d90bd8ca1717462e8b6b541
Use $DISTRO_NAME instead of local lsb_release

The $DISTRO_NAME var is now set in all of the OS elements
in environment.d.  This patch removes the call to
lsb_release and instead uses the $DISTRO_NAME variable.

Change-Id: I7088eb88b6a3611fef5a21a6b62975876549465f
Merge "dpkg: support pkg-map in bin/install-packages"
Merge "opensuse: support pkg-map in bin/install-packages"
Merge "Update base element to make use of pkg-map"
Merge "Use $DISTRO_NAME instead of local lsb_release"
Merge "Disk-image-create should allow sending compat flags to qemu-img"
Merge "Always bind-mount pypi mirror if dir exists"