Package firmware-intel-ucode: Information

- Update to 20180312.
  + New Microcodes:
    sig 0x00050653, pf_mask 0x97, 2018-01-29, rev 0x1000140, size 30720
    sig 0x00050665, pf_mask 0x10, 2018-01-22, rev 0xe000009, size 18432
  + Updated Microcodes:
    sig 0x000206a7, pf_mask 0x12, 2018-02-07, rev 0x002d, size 12288
    sig 0x000206d6, pf_mask 0x6d, 2018-01-30, rev 0x061c, size 18432
    sig 0x000206d7, pf_mask 0x6d, 2018-01-26, rev 0x0713, size 19456
    sig 0x000306a9, pf_mask 0x12, 2018-02-07, rev 0x001f, size 13312
    sig 0x000306c3, pf_mask 0x32, 2018-01-21, rev 0x0024, size 23552
    sig 0x000306d4, pf_mask 0xc0, 2018-01-18, rev 0x002a, size 18432
    sig 0x000306e4, pf_mask 0xed, 2018-01-25, rev 0x042c, size 15360
    sig 0x000306e7, pf_mask 0xed, 2018-02-16, rev 0x0713, size 16384
    sig 0x000306f2, pf_mask 0x6f, 2018-01-19, rev 0x003c, size 33792
    sig 0x000306f4, pf_mask 0x80, 2018-01-22, rev 0x0011, size 17408
    sig 0x00040651, pf_mask 0x72, 2018-01-18, rev 0x0023, size 21504
    sig 0x00040661, pf_mask 0x32, 2018-01-21, rev 0x0019, size 25600
    sig 0x00040671, pf_mask 0x22, 2018-01-21, rev 0x001d, size 12288
    sig 0x000406e3, pf_mask 0xc0, 2017-11-16, rev 0x00c2, size 99328
    sig 0x00050654, pf_mask 0xb7, 2018-01-26, rev 0x2000043, size 28672
    sig 0x00050662, pf_mask 0x10, 2018-01-22, rev 0x0015, size 31744
    sig 0x00050663, pf_mask 0x10, 2018-01-22, rev 0x7000012, size 22528
    sig 0x00050664, pf_mask 0x10, 2018-01-22, rev 0xf000011, size 22528
    sig 0x000506c9, pf_mask 0x03, 2017-03-25, rev 0x002c, size 16384
    sig 0x000506e3, pf_mask 0x36, 2017-11-16, rev 0x00c2, size 99328
    sig 0x000706a1, pf_mask 0x01, 2017-10-31, rev 0x001e, size 72704
    sig 0x000806e9, pf_mask 0xc0, 2018-01-21, rev 0x0084, size 98304
    sig 0x000806ea, pf_mask 0xc0, 2018-01-21, rev 0x0084, size 97280
    sig 0x000906e9, pf_mask 0x2a, 2018-01-21, rev 0x0084, size 98304
    sig 0x000906ea, pf_mask 0x22, 2018-01-21, rev 0x0084, size 96256
    sig 0x000906eb, pf_mask 0x02, 2018-01-21, rev 0x0084, size 98304

- Rollback microcode files back to 20171117 (debian changelog below):
  + Revert to release 20171117, as per Intel instructions issued to
    the public in 2018-01-22 (closes: #886998)
  + This effectively removes IBRS/IBPB/STIPB microcode support for
    Spectre variant 2 mitigation.

- bump epoch (again) and restore old versioning.
- removed external microcode files:
  + sig 0x000306f2, pf_mask 0x6f, 2017-11-17, rev 0x003b (merged)
  + sig 0x000406f1, pf_mask 0xef, 2017-11-18, rev 0xb000025 (downgraded)
  + sig 0x00050654, pf_mask 0xb7, 2017-11-21, rev 0x200003a (obsoleted).