Introducing contrail-server-manager-installer package

Currently dependent packages of server-manager package/related packages needs to get downloaded from internet.
To avoid this, contrail-server-manager-installer will wrap all required dependent and server-manager package itself in it.
So from now,
1. Install contrail-server-manager-installer
Will create /opt/contrail/contrail_server_manager/packages/ and untar all depends files
Will include a setup.sh and README file
2. Execute /opt/contrail/contrail_server_manager/setup.sh
Installs contrail-server-manager and related packages

Closes-Bug: 1383629

Change-Id: Ie6ba3d3a5f5191808399a2e03fdd6c59b241ab17
Merge "Introducing contrail-server-manager-installer package"