added ramfs to selinux ignored filesystems

as reported in #11442

examples/ansible.cfg

@@ -235,4 +235,4 @@ accelerate_daemon_timeout = 30
 # file systems that require special treatment when dealing with security context
 # the default behaviour that copies the existing context or uses the user default
 # needs to be changed to use the file system dependant context.
-#special_context_filesystems=nfs,vboxsf,fuse
+#special_context_filesystems=nfs,vboxsf,fuse,ramfs

lib/ansible/constants.py

@@ -136,7 +136,7 @@ DEFAULT_GATHERING         = get_config(p, DEFAULTS, 'gathering', 'ANSIBLE_GATHER
 DEFAULT_LOG_PATH          = shell_expand_path(get_config(p, DEFAULTS, 'log_path',           'ANSIBLE_LOG_PATH', ''))
 
 # selinux
-DEFAULT_SELINUX_SPECIAL_FS = get_config(p, 'selinux', 'special_context_filesystems', None, 'fuse, nfs, vboxsf', islist=True)
+DEFAULT_SELINUX_SPECIAL_FS = get_config(p, 'selinux', 'special_context_filesystems', None, 'fuse, nfs, vboxsf, ramfs', islist=True)
 
 ### PRIVILEGE ESCALATION ###
 # Backwards Compat