[#91] Failover enhancements

Signed-off-by: Andrey Berezin <a.berezin@yadro.com>

src/frostfs_testlib/load/load_config.py

@@ -1,3 +1,4 @@
+import math
 import os
 from dataclasses import dataclass, field, fields, is_dataclass
 from enum import Enum
@@ -133,6 +134,12 @@ class Preset:
     # S3 region (AKA placement policy for S3 buckets)
     s3_location: Optional[str] = metadata_field(s3_preset_scenarios, "location", None, False)
 
+    # Delay between containers creation and object upload for preset
+    object_upload_delay: Optional[int] = metadata_field(all_load_scenarios, "sleep", None, False)
+
+    # Flag to control preset erorrs
+    ignore_errors: Optional[bool] = metadata_field(all_load_scenarios, "ignore-errors", None, False)
+
 
 @dataclass
 class LoadParams:
@@ -194,6 +201,12 @@ class LoadParams:
     # https://k6.io/docs/using-k6/k6-options/reference/#setup-timeout
     setup_timeout: Optional[str] = metadata_field(all_scenarios, None, "K6_SETUP_TIMEOUT", False)
 
+    # Delay for read operations in case if we read from registry
+    read_age: Optional[int] = metadata_field(all_load_scenarios, None, "READ_AGE", None, False)
+
+    # Initialization time for each VU for k6 load
+    vu_init_time: Optional[float] = None
+
     # ------- CONSTANT VUS SCENARIO PARAMS -------
     # Amount of Writers VU.
     writers: Optional[int] = metadata_field(constant_vus_scenarios, None, "WRITERS", True, True)
@@ -306,6 +319,16 @@ class LoadParams:
 
         return command_args
 
+    def get_init_time(self) -> int:
+        return math.ceil(self._get_total_vus() * self.vu_init_time)
+
+    def _get_total_vus(self) -> int:
+        vu_fields = ["writers", "preallocated_writers"]
+        data_fields = [
+            getattr(self, field.name) or 0 for field in fields(self) if field.name in vu_fields
+        ]
+        return sum(data_fields)
+
     def _get_applicable_fields(self):
         applicable_fields = [
             meta_field