Add the manageiq-postgres_ha_admin gem to the Gemfile

We need this here now that we are using the gem from inside the app

https://bugzilla.redhat.com/show_bug.cgi?id=1391095

Gemfile

@@ -44,6 +44,7 @@ gem "linux_admin",                    "~>1.2.1",       :require => false
 gem "log_decorator",                  "~>0.1",         :require => false
 gem "manageiq-api-client",            "~>0.3.1",       :require => false
 gem "manageiq-messaging",                              :require => false, :git => "https://github.com/ManageIQ/manageiq-messaging", :branch => "master"
+gem "manageiq-postgres_ha_admin",     "~>3.0",         :require => false
 gem "memoist",                        "~>0.15.0",      :require => false
 gem "mime-types",                     "~>3.0",         :path => File.expand_path("mime-types-redirector", __dir__)
 gem "more_core_extensions",           "~>3.5"