Return -o (--output*) option back as deprecated.

Deprecating cli options before removing them is a standard courtesy that
allows project consumers to handle such changes according to their
needs.

Option is removed here: https://review.opendev.org/#/c/701274

Change-Id: Iba4a4574426315a76294269d4287fd3ea18aa99e

doc/source/cli/cli.rst

@@ -296,6 +296,10 @@ List known sites.
 
 Location where the output is saved.
 
+**-o / \\-\\-output** (Optional).
+
+Same as -s (--save-location). Deprecated.
+
 ::
 
   ./pegleg <command> <options> list
@@ -322,6 +326,10 @@ Name of site.
 
 Location where the output is saved.
 
+**-o / \\-\\-output** (Optional).
+
+Same as -s (--save-location). Deprecated.
+
 ::
 
   ./pegleg <command> <options> show site_name
@@ -348,6 +356,10 @@ Name of site.
 
 Location where the output is saved.
 
+**-o / \\-\\-output** (Optional).
+
+Same as -s (--save-location). Deprecated.
+
 **-v / \\-\\-validate** (Optional, Default=True).
 
 Whether to pre-validate documents using built-in schema validation.
@@ -779,6 +791,10 @@ The relative path to the file to be wrapped.
 The output path where the wrapped file is saved. (default: input path with the
 extension replaced with .yaml)
 
+**-o / \\-\\-output-path**
+
+Same as --save-location. Deprecated.
+
 **-s / \\-\\-schema**
 
 The schema for the document to be wrapped, e.g. deckhand/Certificate/v1

pegleg/cli/commands.py

@@ -332,11 +332,13 @@ def generate_pki_deprecated(site_name, author, days, regenerate_all):
     'filename',
     help='The relative file path for the file to be wrapped.')
 @click.option(
+    '-o',  # DEPRECATED
+    '--output-path',  # DEPRECATED
     '--save-location',
     'save_location',
     required=False,
     help='The output path where the wrapped file is saved. (default: input '
-    'path with .yaml).')
+    'path with .yaml). -o (--output-path) is deprecated and will be removed.')
 @click.option(
     '-s',
     '--schema',

pegleg/cli/utils.py

@@ -92,8 +92,11 @@ MAIN_REPOSITORY_OPTION = click.option(
 SAVE_LOCATION_OPTION = click.option(
     '-s',
     '--save-location',
+    '-o',  # DEPRECATED
+    '--output',  # DEPRECATED
     'save_location',
-    help='Where to save the output. Defaults to stdout.')
+    help='Where to save the output. Defaults to stdout. '
+    '-o (--output) is deprecated and will be removed.')
 
 REPOSITORY_CLONE_PATH_OPTION = click.option(
     '-p',