Selinux parsing with multiple levels

The parsing portion of set_selinux_context(file, value, component = false) does not account for multiple levels/sensitivities. The range component can contain a ":" on MLS systems for example

"unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c255
user : role : type : range "

When the function splits on ":" it causes only the first part of the range to be reset, and the second half to be preserved. This makes the selrange to grow indefinitely

Example:
Initial

• security.selinux="system_u:object_r:auditd_log_t:s15:c0.c16383"
  After 1 puppet run
• security.selinux="system_u:object_r:auditd_log_t:s15:c0.c16383:c0.c16383"
  etc.

I have attached a patch that seems to fix it on my system, but the parse_selinux_context() function seems to do it better, so i'll leave it up to people with more ruby-fu than I have