nvs_flash: fixed deinit other partition's handles

* When deinitializing or erasing a partition,
  nvs used to close all handles instead of only
  the current partition's handles.
  This is fixed now
* Added a unit test for that case

Closes FCS-533

components/nvs_flash/src/nvs_api.cpp

@@ -19,6 +19,7 @@
 #include "nvs_partition_manager.hpp"
 #include "esp_partition.h"
 #include "sdkconfig.h"
+#include <functional>
 #include "nvs_handle_simple.hpp"
 
 #ifdef ESP_PLATFORM
@@ -84,8 +85,16 @@ extern "C" void nvs_dump(const char *partName)
 
 static esp_err_t close_handles_and_deinit(const char* part_name)
 {
-    // Delete all corresponding open handles
-    s_nvs_handles.clearAndFreeNodes();
+    auto belongs_to_part = [=](NVSHandleEntry& e) -> bool {
+        return e.nvs_handle->get_partition_name() == part_name;
+    };
+
+    auto it = find_if(begin(s_nvs_handles), end(s_nvs_handles), belongs_to_part);
+
+    while (it != end(s_nvs_handles)) {
+        s_nvs_handles.erase(it);
+        it = find_if(begin(s_nvs_handles), end(s_nvs_handles), belongs_to_part);
+    }
 
     // Deinit partition
     return NVSPartitionManager::get_instance()->deinit_partition(part_name);