change bosh-lite instance type to r3.2xlarge
change bosh-lite instance type to r3.2xlarge

Make instance type a task param.

[#132357857]

Signed-off-by: Nick Wei <397a225b6adb51a440bd3821475520403c3e9564@pivotal.io>

fujitsu-cf/cli,simonleung8/cli,simonleung8/cli,fujitsu-cf/cli,simonleung8/cli,fujitsu-cf/cli