Load profile properties from environment variables

[t1m0thyj]

When loading a profile from team config, have an opt-in flag to support loading of properties from environment variables.

For example, in an environment where I don't want to store credentials securely, the user and password properties should be loaded from ZOWE_OPT_USER and ZOWE_OPT_PASSWORD respectively.

[bhavukkalra]

Hey there @t1m0thyj. Just for clarification purposes for this issue. Is the idea here to load the Environment variables from a user provided, local .env file?

[bhavukkalra]

For the below discussion I'll be taking this code as reference:

# (This is what I got from the readme, Doesn't works)
# from zowe.zos_core_for_zowe_sdk import ProfileManager 

# This one works
from zowe.core_for_zowe_sdk import ProfileManager

from zowe.zos_console_for_zowe_sdk import Console

# Creates a dictionary object (example)
# {'host': 'globalhost', 'rejectUnauthorized': True, 'user': 'bhavuk', 'password': 'bh', 'port': 443}
profile = ProfileManager(appname="Give user config name here").load(profile_type="zosmf")

my_console = Console(profile)

Question 1 - The import that is mentioned in the readme in the next branch.

from zowe.zos_core_for_zowe_sdk import ProfileManager 

Doesn't work, I replaced it with something that does. (Correct it in the readme as well via PR?)

Question 2 - I have now clearly understood on how the configs are getting inputed. I have a few clarifying questions on how the above feature is supposed to look like

Example 1 - Create a function load_from_environment_file() in the file profile_manager.py which in implementation could look something like

profile = ProfileManager(appname="Give user config name here").load_from_env_file("ENV_FILE_PATH_HERE)")

load_from_env_file will contain logic for parsing the input .env file and output a dictionary of configs

Example 2 - More Info on the opt-in flag. Like a use case scenario could really help on how are we imagining the functionality should look like.

[t1m0thyj]

Environment variables take priority over values defined in the config
Can load list of properties (host, port, user, password, etc) from schema

[t1m0thyj]

Environment variables have ZOWE_OPT_ prefix
camelCase properties in config/schema JSON map to snake_case in environment variables
For example: Env Var to override rejectUnauthorized property is ZOWE_OPT_REJECT_UNAUTHORIZED