Conda environment for macOS(Hosted macOS Preview) and Windows (Hosted)

[guolinke]

it seems both "Hosted macOS Preview" and "Hosted" agents didn't support conda:

2018-06-30T00:55:14.1692970Z ##[section]Starting: CondaEnvironment
2018-06-30T00:55:14.1897031Z ==============================================================================
2018-06-30T00:55:14.1897301Z Task         : Conda Environment
2018-06-30T00:55:14.1897495Z Description  : Create and activate a Conda environment.
2018-06-30T00:55:14.1897690Z Version      : 0.135.0
2018-06-30T00:55:14.1897859Z Author       : Microsoft Corporation
2018-06-30T00:55:14.1898078Z Help         : [More information](https://go.microsoft.com/fwlink/?linkid=873466)
2018-06-30T00:55:14.1898315Z ==============================================================================
2018-06-30T00:55:14.9206030Z ##[error]The `conda` executable was not found on the system. Ask your administrator to install Miniconda or Anaconda. Then add the `conda` executable to `PATH` or set the `CONDA` environment variable to the root of the installation.
2018-06-30T00:55:14.9216983Z ##[error]The `conda` executable was not found on the system. Ask your administrator to install Miniconda or Anaconda. Then add the `conda` executable to `PATH` or set the `CONDA` environment variable to the root of the installation.
2018-06-30T00:55:14.9234606Z ##[section]Finishing: CondaEnvironment

[TingluoHuang]

@guolinke please log an issue in the following repro.

• Hosted Agent Image Repository - contains the VM image used in the VSTS Hosted Agent Pool. If you are having Build/Release failures that seems like they are related to software installed on the Hosted Agent (e.g. the DotnetSDK is missing or the AzureSDK is not on the latest version) please log an issue here.

[guolinke]

Thanks so much