[core] Support ZOWE_CLI_HOME directory for log file location

[t1m0thyj]

The default location of the .zowe folder is ~/.zowe as used here. In Zowe CLI and Zowe Explorer, it can be overridden with the ZOWE_CLI_HOME environment variable to point to another directory.

We may want to check for the existence of os.environ["ZOWE_CLI_HOME"], and if it is defined then store the logs directory inside it. This could be addressed in a separate issue 🙂

Originally posted by @t1m0thyj in #268 (comment)

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