Fix network template for redhat and add test cases

Change-Id: Ic847cee0b553f75f5f3f17f0602a995d5f6618f6
Test setting max log file size from spec

Change-Id: I01a5507b05594c38a88e7f49a937ae35ff776a25
Use Bosh::Common.sh to shell out

Change-Id: I2d4830610cbcaf7ab6a42f6df082e8dece714f79
Delete env-dependent case for partition device

Change-Id: I920e2deb0cf4285418204a28efd8175103a0527c