Add new enable-packages-install element

This element will set the install types to package for
a specified set of elements (see readme for full list).
This element is for convenience until diskimage-builder
is updated to global set package installs.

Change-Id: I8c35d55e7cffb358613436d87ee67e6484533bbb

elements/enable-packages-install/README.md

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+enable-packages-install
+
+This element will set the install types to package for the following elements:
+
+    - nova
+    - heat
+    - keystone
+    - neutron
+    - glance
+    - swift
+    - cinder
+    - horizon
+    - python_cinderclient
+    - python_glanceclient
+    - python_heatclient
+    - python_keystoneclient
+    - python_neutronclient
+    - python_novaclient
+    - python_swiftclient
+    - python_ceilometerclient
+    - python_ironicclient
+    - os_collect_config
+    - os_refresh_config
+    - os_apply_config
+    - novnc
+    - get_pip_py
+

elements/enable-packages-install/environment.d/01-export-install-types.bash

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+export DIB_INSTALLTYPE_nova=package
+export DIB_INSTALLTYPE_heat=package
+export DIB_INSTALLTYPE_keystone=package
+export DIB_INSTALLTYPE_neutron=package
+export DIB_INSTALLTYPE_glance=package
+export DIB_INSTALLTYPE_swift=package
+export DIB_INSTALLTYPE_cinder=package
+export DIB_INSTALLTYPE_horizon=package
+
+export DIB_INSTALLTYPE_python_cinderclient=package
+export DIB_INSTALLTYPE_python_glanceclient=package
+export DIB_INSTALLTYPE_python_heatclient=package
+export DIB_INSTALLTYPE_python_keystoneclient=package
+export DIB_INSTALLTYPE_python_neutronclient=package
+export DIB_INSTALLTYPE_python_novaclient=package
+export DIB_INSTALLTYPE_python_swiftclient=package
+export DIB_INSTALLTYPE_python_ceilometerclient=package
+export DIB_INSTALLTYPE_python_ironicclient=package
+
+export DIB_INSTALLTYPE_os_collect_config=package
+export DIB_INSTALLTYPE_os_refresh_config=package
+export DIB_INSTALLTYPE_os_apply_config=package
+
+export DIB_INSTALLTYPE_novnc=package
+export DIB_INSTALLTYPE_get_pip_py=package