Prepare for 802.1p:  Add macro EVL_APPLY_VLID() which may be used to apply an 802.1q VLAN ID  to the M_VLANTAG field in an mbuf packet header non-destructively.  This will be used by net80211 to begin with.
Prepare for 802.1p:
 Add macro EVL_APPLY_VLID() which may be used to apply an 802.1q VLAN ID
 to the M_VLANTAG field in an mbuf packet header non-destructively.
 This will be used by net80211 to begin with.

 Add macro EVL_APPLY_PRI() which may be used to apply an 802.1p priority
 class to the M_VLANTAG field in an mbuf packet header non-destructively.

 Add other macros for manipulating tags and the CFI bit.

Submitted by:	Boris Kovalenko (EVL_CFIOFTAG(), EVL_MAKETAG())

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