Add FreeBSD to Shippable CI. (#16883)

test/integration/Makefile

@@ -98,6 +98,8 @@ endif
 # Otherwise use the test_default inventory group, which runs fewer tests, but should work on any system.
 ifeq ($(container),docker)
 TEST_CONNECTION_FILTER := 'test_docker'
+else ifeq ($(container),freebsd)
+TEST_CONNECTION_FILTER := 'test_freebsd'
 else
 TEST_CONNECTION_FILTER := 'test_default'
 endif

test/integration/inventory.remote.template

@@ -0,0 +1,8 @@
+[posix]
+remote
+
+[posix:vars]
+ansible_connection=ssh
+ansible_host=@ansible_host
+ansible_user=@ansible_user
+ansible_python_interpreter=/usr/local/bin/python2

test/integration/test_connection.inventory

@@ -81,3 +81,8 @@ chroot
 test_default
 ssh
 paramiko_ssh
+
+[test_freebsd:children]
+test_default
+ssh
+paramiko_ssh