[reconfig] Finish end-to-end reconfig test

[lxfind]

This PR fixes a few issues in the reconfiguration end-to-end test and add the flow of adding a new validator:

1. Increases the validator name limit. We were hitting that limit
2. Uses shared object transaction instead of owned object transaction

TODO: The test currently fails due to network connection issue. After we fix this, we need to remove the count from the reconfiguration loop