Change chip-tool to put its platform KVS in its storage directory.

And also name it chip_tool_kvs, not chip_kvs.  This should avoid chip-tool
stomping on the KVS of server-side apps.

examples/chip-tool/commands/common/Commands.cpp

@@ -290,6 +290,10 @@ CHIP_ERROR Commands::RunCommand(int argc, char ** argv, bool interactive,
     }
 
     chip::Logging::SetLogFilter(mStorage.GetLoggingLevel());
+
+    std::string storageDirectory = mStorage.GetDirectory();
+    std::string platformKVS = storageDirectory + "/chip_tool_kvs";
+    chip::DeviceLayer::PersistedStorage::KeyValueStoreMgrImpl().Init(platformKVS.c_str());
 #endif // CONFIG_USE_LOCAL_STORAGE
 
     return command->Run();

src/controller/ExamplePersistentStorage.cpp

@@ -39,7 +39,7 @@ constexpr const char kLocalNodeIdKey[]      = "LocalNodeId";
 constexpr const char kCommissionerCATsKey[] = "CommissionerCATs";
 constexpr LogCategory kDefaultLoggingLevel  = kLogCategory_Automation;
 
-std::string GetFilename(const char * directory, const char * name)
+const char * GetUsedDirectory(const char * directory)
 {
     const char * dir = directory;
 
@@ -53,6 +53,13 @@ std::string GetFilename(const char * directory, const char * name)
         dir = "/tmp";
     }
 
+    return dir;
+}
+
+std::string GetFilename(const char * directory, const char * name)
+{
+    const char * dir = GetUsedDirectory(directory);
+
     if (name == nullptr)
     {
         return std::string(dir) + "/chip_tool_config.ini";
@@ -182,6 +189,11 @@ CHIP_ERROR PersistentStorage::SyncClearAll()
     return CommitConfig(mDirectory, mName);
 }
 
+const char * PersistentStorage::GetDirectory() const
+{
+    return GetUsedDirectory(mDirectory);
+}
+
 CHIP_ERROR PersistentStorage::CommitConfig(const char * directory, const char * name)
 {
     CHIP_ERROR err = CHIP_NO_ERROR;

src/controller/ExamplePersistentStorage.h

@@ -65,6 +65,9 @@ class PersistentStorage : public chip::PersistentStorageDelegate
     // Clear all of the persistent storage for running session.
     CHIP_ERROR SyncClearAll();
 
+    // Get the directory actually being used for the storage.
+    const char * GetDirectory() const;
+
 private:
     CHIP_ERROR CommitConfig(const char * directory, const char * name);
     inipp::Ini<char> mConfig;