Replace Warden test helpers with Devise ones

spec/requests/epp/domain/create/account_balance_spec.rb

@@ -37,7 +37,7 @@ RSpec.describe 'EPP domain:create', settings: false do
   before :example do
     travel_to Time.zone.parse('05.07.2010')
     Setting.days_to_renew_domain_before_expire = 0
-    login_as user
+    sign_in user
   end
 
   context 'when account balance is sufficient' do

spec/requests/epp/domain/create/default_period_spec.rb

@@ -38,7 +38,7 @@ RSpec.describe 'EPP domain:create', settings: false do
   before :example do
     travel_to Time.zone.parse('05.07.2010 10:30')
     Setting.days_to_renew_domain_before_expire = 0
-    login_as user
+    sign_in user
   end
 
   context 'when period is absent' do

spec/requests/epp/domain/create/optional_nameserver_spec.rb

@@ -18,7 +18,7 @@ RSpec.describe 'EPP domain:create', settings: false do
 
   before :example do
     travel_to Time.zone.parse('05.07.2010')
-    login_as user
+    sign_in user
   end
 
   context 'when nameserver is optional' do

spec/requests/epp/domain/create/period_spec.rb

@@ -11,7 +11,7 @@ RSpec.describe 'EPP domain:create', settings: false do
   before :example do
     travel_to Time.zone.parse('05.07.2010 10:30')
     Setting.days_to_renew_domain_before_expire = 0
-    login_as user
+    sign_in user
   end
 
   context 'when period is 3 months' do

spec/requests/epp/domain/create/price_spec.rb

@@ -31,7 +31,7 @@ RSpec.describe 'EPP domain:create', settings: false do
   before :example do
     travel_to Time.zone.parse('05.07.2010')
     Setting.days_to_renew_domain_before_expire = 0
-    login_as user
+    sign_in user
   end
 
   context 'when price is present' do

spec/requests/epp/domain/create/required_nameserver_spec.rb

@@ -18,7 +18,7 @@ RSpec.describe 'EPP domain:create', settings: false do
 
   before :example do
     travel_to Time.zone.parse('05.07.2010')
-    login_as user
+    sign_in user
   end
 
   context 'when nameserver is required' do