Fix keeper shutdown in case of initialization failed

Simple repro:

  $ clickhouse-keeper-data-dumper /tmp/no-such-dir/snapshots/ /tmp/no-such-dir/logs

Signed-off-by: Azat Khuzhin <[email protected]>

Author: azat

src/Coordination/Changelog.cpp

@@ -2399,6 +2399,14 @@ Changelog::~Changelog()
     try
     {
         flush();
+    }
+    catch (...)
+    {
+        tryLogCurrentException(__PRETTY_FUNCTION__);
+    }
+
+    try
+    {
         shutdown();
     }
     catch (...)