Get config information from servicex.yaml and servicex.yml and .servicex files (#138)

With this PR, the frontend will search for config information in a servicex.yaml, servicex.yml, and .servicex files (in that order)

Author: gordonwatts

README.md

@@ -28,7 +28,7 @@ Before you can use this library you'll need:
 
 The API access information is normally placed in a `.servicex` file (to keep this confidential information form accidentally getting checked into a public repository). The `servicex` library searches for configuration information in several locations to determine what end-point it should connect to, in the following order:
 
-1. A `.servicex` file in the current working directory
+1. A `.servicex` file in the current working directory (it can also be named `servicex.yaml` or `servicex.yml`)
 1. A `.servicex` file in the user's home directory (`$HOME` on Linux and Mac, and your profile
    directory on Windows).
 1. The `config_defaults.yaml` file distributed with the `servicex` package.
@@ -138,6 +138,12 @@ As mentioned above, the `.servicex` file is read to pull a configuration. The se
 1. Your current working directory
 2. Your home directory
 
+The file can be named any of the following (ordered by precedence):
+
+- `servicex.yaml`
+- `servicex.yml`
+- `.servicex`
+
 The file can contain an `api_endpoint` as mentioned above. In addition the other following things can be put in:
 
 - `cache_path`: Location where queries, data, and a record of queries are written. This should be an absolute path the person running the library has r/w access to. On windows, make sure to escape `\` - and best to follow standard `yaml` conventions and put the path in quotes - especially if it contains a space. Top level yaml item (don't indent it accidentally!). Defaults to `/tmp/servicex` (with the temp directory as appropriate for your platform) Examples:

servicex/ConfigSettings.py

@@ -21,8 +21,9 @@ def _add_local_source(self):
         '''
         Look for a '.xxx" file in the local directory
         '''
-        p = Path(f'.{self.appname}')
-        self._add_from_path(p)
+        self._add_from_path(Path(f'{self.appname}.yaml'))
+        self._add_from_path(Path(f'{self.appname}.yml'))
+        self._add_from_path(Path(f'.{self.appname}'))
 
     def _add_from_path(self, p: Path):
         if p.exists():
@@ -33,4 +34,6 @@ def _add_home_source(self):
         '''
         Look for a '.xxx" file in the local directory
         '''
+        self._add_from_path(Path.home() / f'{self.appname}.yaml')
+        self._add_from_path(Path.home() / f'{self.appname}.yml')
         self._add_from_path(Path.home() / f'.{self.appname}')