Document '--path' and '--cli-version' of "install-cli" command of service-manager plugin

The service-manager plugin has support to install client binaries via "install-cli" command.

New options are added to this command as:

• '--path' : "Specify the absolute or relative path as value where the binary should be installed" (Note: this path should be accessible to user to write)
  Eg "--path /home/<user>/cli/oc" for openshift binary
• '--cli-version' : 'Specify the version of the binary as value to be installed' (These are the valid origin oc binary versions like 1.2.0, 1.2.1, 1.3.0, 1.3.1 etc)

More in this link (Note: here --path description mentions relative path which is an issue being tracked here )