set ABI to 6.slh.1.

* set ABI to 6.slh.1.
* import 3.17.5.
* import 3.17.6.
* add patches from the -stable queue:
  - mm-frontswap-invalidate-expired-data-on-a-dup-store-failure
  - mm-vmpressure.c-fix-race-in-vmpressure_work_fn
  - drivers-input-evdev.c-don-t-kfree-a-vmalloc-address
  - fat-fix-oops-on-corrupted-vfat-fs
  - mm-fix-swapoff-hang-after-page-migration-and-fork
  - mm-fix-anon_vma_clone-error-treatment
  - slab-fix-nodeid-bounds-check-for-non-contiguous-node-ids
  - xen-netfront-remove-bugs-on-paged-skb-data-which-crosses-a-page-boundary
  - drm-nouveau-gf116-remove-copy1-engine
  - nouveau-move-the-hotplug-ignore-to-correct-place
  - i2c-omap-fix-nack-and-arbitration-lost-irq-handling
  - i2c-omap-fix-i207-errata-handling
  - i2c-davinci-generate-stp-always-when-nack-is-received
  - i2c-cadence-set-the-hardware-time-out-register-to-maximum-value
  - drm-radeon-ignore-radeon_gem_gtt_wc-on-32-bit-x86
  - drm-radeon-kernel-panic-in-drm_calc_vbltimestamp_from_scanoutpos-with-
    3.18.0-rc6
  - of-fdt-memblock_reserve-memreserve-regions-in-the-case-of-partial-
    overlap
  - drm-i915-more-cautious-with-pch-fifo-underruns
  - drm-i915-unlock-panel-even-when-lvds-is-disabled
  - x86-use-objdump-instead-of-plain-objdump
  - media-rc-core-fix-toggle-handling-in-the-rc6-decoder
  - media-s2255drv-fix-payload-size-for-jpg-mjpeg
  - media-smiapp-only-some-selection-targets-are-settable