Add support for parameter_defaults in environment

https://review.openstack.org/#/c/131337/ adds support for a new
section "parameter_defaults" in the environment, so support it
in the client

blueprint env-nested-usability

Change-Id: Ia1f27102f31a42e7b58008a9b4886cde293308c6
Curl statements to include globoff for IPv6 URLs

python-heatclient displays curl statements for debugging/troubleshooting
purposes. For IPv6 URLs, curl requires --globoff to be passed in the
arguments. Since heatclient does not use curl directly, this patch
displays the curl commands with globoff option which works for both
IPv4 and IPv6 URLs.
Fix adapted from python-novaclient Ib7099e8e3bbc15f29bbaa1db37ef21e78a74e7bc

Closes-Bug: #1228744
Change-Id: I1ace9268b09e6fc0d0c0ff02ce1f2e31940d961d
Show the creation_time for stack snapshot list

Show the creation_time information for stack snapshot
list.

Change-Id: I3366e00fdda025693c3151755528ec18d190ed23
Closes-Bug: #1399500
Initial setup for i18n support

Change-Id: Ifc912b31fe2f71d5267827321b8de0420ad62903
Partial-Bug: #1269930
Merge "Add support for parameter_defaults in environment"
Merge "Show the creation_time for stack snapshot list"
Merge "Initial setup for i18n support"
Merge "Curl statements to include globoff for IPv6 URLs"