acl: fix cli tag parsing
acl: fix cli tag parsing

 - tag is expected to be 64-bytes
 - when specifying tag on cli, a vector is allocated. Make sure it is
   freed

Type: fix

Change-Id: Id1741fe406819ca9f71edb081d4483f52cae547d
Signed-off-by: Benoît Ganne <38aad8ffcfa407b890d258e568f161530f66882d@cisco.com>

chrisy/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp