Fix some commands key spec in json files (#10779)

There are some commands that has the wrong key specs.
This PR adds a key-spec related check in generate-command-code.py.
Check if the index is valid, or if there is an unused index.

The check result will look like:
```
[root]# python utils/generate-command-code.py
Processing json files...
Linking container command to subcommands...
Checking all commands...
command: RESTORE_ASKING may have unused key_spec
command: RENAME may have unused key_spec
command: PFDEBUG may have unused key_spec
command: WATCH key_specs missing flags
command: LCS arg: key2 key_spec_index error
command: RENAMENX may have unused key_spec
Error: There are errors in the commands check, please check the above logs.
```

The following commands have been fixed according to the check results:
- RESTORE ASKING: add missing arguments section (and history section)
- RENAME: newkey's key_spec_index should be 1
- PFDEBUG: add missing arguments (and change the arity from -3 to 3)
- WATCH: add missing key_specs flags: RO, like EXIST (it allow you to know the key exists, or is modified, but doesn't "leak" the data)
- LCS: key2 key_spec_index error, there is only one key-spec
- RENAMENX: newkey's key_spec_index should be 1

1 files changed, 4 insertions, 3 deletions

diff --git a/utils/generate-commands-json.py b/utils/generate-commands-json.py
index 8f812f224..23782ea22 100755
--- a/utils/generate-commands-json.py
+++ b/utils/generate-commands-json.py
@@ -1,10 +1,10 @@
 #!/usr/bin/env python3
 import argparse
 import json
+import os
 import subprocess
 from collections import OrderedDict
-from sys import argv, stdin
-import os
+from sys import argv
 
 
 def convert_flags_to_boolean_dict(flags):
@@ -118,7 +118,8 @@ if __name__ == '__main__':
     stdout, stderr = p.communicate()
     commands = json.loads(stdout)
 
-    p = subprocess.Popen([args.cli, '-h', args.host, '-p', str(args.port), '--json', 'command', 'docs'], stdout=subprocess.PIPE)
+    p = subprocess.Popen([args.cli, '-h', args.host, '-p', str(args.port), '--json', 'command', 'docs'],
+                         stdout=subprocess.PIPE)
     stdout, stderr = p.communicate()
     docs = json.loads(stdout)