Fixed positional order of arguments

The positional arguments of backup-create and configuration-attach
were different from all other commands.  'Instance' is now the
first argument for these commands as well.

DocImpact: This potentially affects any user scripts that may
exist.  Any instructions like:
'trove backup-create mybackup myinstance'
'trove configuration-attach myconfig myinstance'
should be changed to:
'trove backup-create myinstance mybackup.'
'trove configuration-attach myinstance myconfig'

Change-Id: I2ff93a1a6e26f3e33a60cbf3d9ad5ee074307e8f
Closes-Bug: #1281878
Updates README with current trove help output

Reasons:
- trove help section in README shows old options, trove help message
  has changed now, and the section needs the update.

Changes:
- Updates the trove help section in README.
- The updates have been picked up from latest trove help output.

Change-Id: I37b6f3ad5d3ac0497eec179a4de447e5b39fb215
Closes-Bug: #1322819
Updated from global requirements

Change-Id: Iebb53ff60de51a140c7684ecfd2dbc6a15f3c04c
Merge "Updates README with current trove help output"
Merge "Fixed positional order of arguments"
Merge "Updated from global requirements"