Add a build mode to the installer to facilitate partition dump#846

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padmanarayana wants to merge 2 commits intosonic-net:masterfrom

padmanarayana:sonic_install_env_build_mode

Commits on Jul 26, 2017

Add a build mode to the installer to facilitate partition dump creation in build environment
padmanarayana
committed

Commits on Jul 28, 2017

Remove platform check while generating the partition dump post onie installer build
padmanarayana
committed