//TODO: Delete this.
public async Task<IActionResult> Seed()
{
    await _userManager.CreateAsync(new Agent
    {
        AccountId = new Guid("a0a28a07-3007-4016-9dbf-fd0b1dd28b8b"),
        Email = "zen@gmail.com",
        UserName = "zen@gmail.com",
        FirstName = "Zen",
        LastName = "Huxtable",
        EmailConfirmed = true,
        AgentRoles = new List<AgentRole> { new AgentRole { RoleId = 1 } }
    });
    var zen = await _userManager.FindByEmailAsync("zen@gmail.com");
    await _userManager.AddPasswordAsync(zen, "Altair2222");

    await _userManager.CreateAsync(new Agent
    {
        AccountId = new Guid("a0a28a07-3007-4016-9dbf-fd0b1dd28b8b"),
        Email = "ben@gmail.com",
        UserName = "ben@gmail.com",
        FirstName = "Ben",
        LastName = "Huxtable",
        EmailConfirmed = true,
        AgentRoles = new List<AgentRole> { new AgentRole { RoleId = 2 } }
    });
    var ben = await _userManager.FindByEmailAsync("ben@gmail.com");
    await _userManager.AddPasswordAsync(ben, "Altair2222");

    await _userManager.CreateAsync(new Agent
    {
        AccountId = new Guid("39b02771-b302-4c4c-95d5-9ae30fded7d2"),
        Email = "ken@gmail.com",
        UserName = "ken@gmail.com",
        FirstName = "Ken",
        LastName = "Huxtable",
        EmailConfirmed = true,
        AgentRoles = new List<AgentRole> { new AgentRole { RoleId = 3 } }
    });
    var ken = await _userManager.FindByEmailAsync("ken@gmail.com");
    await _userManager.AddPasswordAsync(ken, "Altair2222");

    await _userManager.CreateAsync(new Agent
    {
        AccountId = new Guid("39b02771-b302-4c4c-95d5-9ae30fded7d2"),
        Email = "ryu@gmail.com",
        UserName = "ryu@gmail.com",
        FirstName = "Ryu",
        LastName = "Huxtable",
        EmailConfirmed = true,
        AgentRoles = new List<AgentRole> { new AgentRole { RoleId = 4 } }
    });
    var ryu = await _userManager.FindByEmailAsync("ryu@gmail.com");
    await _userManager.AddPasswordAsync(ryu, "Altair2222");

    return Ok();
}