[ADD] DCOS-1301 Error message if installation path contains whitespaces
[ADD] DCOS-1301 Error message if installation path contains whitespaces

Yhgenomics/dcos-cli,kensipe/dcos-cli,Yhgenomics/dcos-cli,dcos/dcos-cli,kensipe/dcos-cli,mesosphere/dcos-cli,sis-tools/dcos-cli,genome21/dcos-cli,sis-tools/dcos-cli,dcos/dcos-cli,dcos/dcos-cli,kensipe/dcos-cli,sis-tools/dcos-cli,kensipe/dcos-cli,dcos/dcos-cli,kensipe/dcos-cli,dcos/dcos-cli,mesosphere/dcos-cli,genome21/dcos-cli,mesosphere/dcos-cli