sendmail aliases context

[Paul Howarth]

Upstream sendmail has aliases in /etc/mail/aliases(.db)? rather than 
/etc/aliases(.db)?

I therefore suggest adding the following contexts to policy for the 
benefit those of us rolling our own sendmail packages:

/etc/mail/aliases -- gen_context(system_u:object_r:etc_aliases_t,s0)
/etc/mail/aliases\.db -- gen_context(system_u:object_r:etc_aliases_t,s0)

Paul,