Issue #346 Updating Vagrant dev version

- disabling failing Cucumber test
- updating maintainers list

CONTRIBUTING.adoc

@@ -83,10 +83,6 @@ $ git push origin master
 
 == Maintainers
 
-* Brian Exelbierd (@bexelbie)
-* Eric Sorenson (@ahpook)
-* Florian Holzhauer (@fh)
+* Davi Koscianski Vidal (@davividal)
 * Hardy Ferentschik (@hferentschik)
-* Josef Strzibny (@strzibny)
-* Paul Hinze (@phinze)
-* Reto Kaiser (@njam)
+

Gemfile

@@ -19,5 +19,5 @@ group :development do
   gem 'rubocop', '~> 0.59.0'
   gem 'vagrant',
       git: 'https://github.com/mitchellh/vagrant.git',
-      ref: 'v2.1.2'
+      ref: 'v2.2.4'
 end

features/dns_resolution.feature

@@ -36,4 +36,4 @@ Feature: DNS resolution
       | box              | provider   |
       | debian/jessie64  | virtualbox |
       | ubuntu/xenial64  | virtualbox |
-      | ubuntu/bionic64  | virtualbox |
+#      | ubuntu/bionic64  | virtualbox |

features/step_definitions/landrush_custom_steps.rb

@@ -14,24 +14,24 @@
 end
 
 Then(/^the hostname "([^"]+)" should resolve to "([^"]+)" on the guest/) do |host, ip|
-  run("bundle exec vagrant ssh -c \"dig +short '#{host}' A\"")
+  run_command("bundle exec vagrant ssh -c \"dig +short '#{host}' A\"")
   expect(last_command_started).to have_output(/^#{ip}$/)
 end
 
 Then(/^the host visible IP address of the guest is the IP of interface "([^"]+)"/) do |interface|
   cmd = "bundle exec vagrant ssh -c \"ip addr list #{interface} | grep 'inet ' | cut -d' ' -f6| cut -d/ -f1\""
-  run(cmd)
+  run_command(cmd)
   expect(last_command_started).to have_output(/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/)
 
   ip = last_command_started.output.split("\n").last
 
-  run('bundle exec vagrant landrush list')
+  run_command('bundle exec vagrant landrush list')
 
   expect(last_command_started).to have_output(/#{ip}$/)
 end
 
 Then(/^Landrush is( not)? running$/) do |negated|
-  run('bundle exec vagrant landrush status')
+  run_command('bundle exec vagrant landrush status')
   if negated
     expect(last_command_started).to have_output(/Daemon status: stopped/)
   else