[dsc] DSC Release 2.1.0

[Jerry Lundström]

Hi,

This release brings a couple of new features, the ability to change the
interval [1] for which DSC writes out the statistics files and a new
indexer for AS numbers [2].
There was also an issue [3] detected in Ubuntu 16.04 when reading pcap
files would result in doubling the statistics if running in daemon mode.
Looking at the strace it might be a issue with the kernel, libc, pcap or
a combination that results in the open file handle to reset and
essentially read all the data twice.

    https://www.dns-oarc.net/files/dsc/dsc-2.1.0.tar.gz
    47ba402b0bace79cfb95a4231ca53dca6ccd6decb32cec685be748dc561c8c49

Credits:
- Klaus Darilion NIC.AT for interval changes and AS number indexer.

Commits:

8ab8632 Rewrote ASN indexer to remove the need for malloc/free. Removed
        the need to malloc ipstr. Use same unknown tags as country
        indexer.
89d4984 add ASN index: maps src-IP to AS number using GeoIP ASNum DB
8d5c6bf Fix #14: Remove ncap
c0f00e7 Add test for statistics_interval
cf9ede2 Add checks and documentation for statistics_interval
93eeecd new config option 'statistics_interval' (defaults to 60s)
a28f5d4 Fix #62: Do not go into daemon mode if reading offline files
2bc1abb Add information about puppet module

[1] https://github.com/DNS-OARC/dsc/pull/64
[2] https://github.com/DNS-OARC/dsc/pull/66
[3] https://github.com/DNS-OARC/dsc/pull/62