Add APNs for docomo MVNOs (Japan)

@nifty: http://support.nifty.com/support/manual/internet/dolte/
BB.excite: http://support.excite.co.jp/app/answers/detail/a_id/3090
BIGLOBE: http://support.biglobe.ne.jp/settei/setuzoku/lte/index.html
DTI: http://dream.jp/mb/sim/support/manual/mnl_and_01.html
OCN: http://tech.support.ntt.com/ocn/mobile/one/
So-net: http://faq.so-net.ne.jp/app/answers/detail/a_id/2920/
U-mobile: http://umobile.jp/service/sim/setting/
WirelessGate: http://www.wirelessgate.co.jp/sim/service/yd/start_apn
hi-ho: http://home.hi-ho.ne.jp/hihomobile/lte/d/index.html?page=setting
楽天 エントリー/ライト/アクティブ: http://broadband.rakuten.co.jp/support/manual_internet/lte/android.html

Change-Id: I42d84cb7396029b974e63d8c39c94ade20247893
added Walmart APN

Change-Id: Ic9392cefde2cf6e6c3a00d77d3e4a91d2de7a7c1
add FreedomPop APN for 4G/LTE

Change-Id: I912969cfaf5f9787132d24848891da59642f854f
apns-conf: Fix Digi MMS port.

Change-Id: Id6c9c4916b0378f6f2c99d023f7dd8237d26b47a
added Sprint Test APNs

Change-Id: I0a276b5a4dd2a6fc071a4f9330bafd2cafb3405a
add apn for ziggo & modify videotron for LTE
per CYAN-5248 & CYAN-5295 respectively

Change-Id: I0899ea45138f46f0a058a26e00b429912376a361
Correct APNs for Movistar PA, Claro PA, Digicel PA

Movistar & Digicel had missing mcc/mnc fields. Claro apn was already
included under the name "Claro Web".

Change-Id: I12e698645f4f0ff0209041a4ba841cb92b95bf7f
Remove duplicate Vodafone APN, correct Tele2 APN

Duplicate Vodafone entry had incorrect trailing spaces in APN and user
field
Tele2 MMS entry had an extra space in apn field.

Change-Id: I6f0c9e8d5ca9a4c197a12d92588f800d28b94338
cm: Update use of vendor/extra `

 * Use inherit-product to pick up extra configuration

Change-Id: Icb0c8b09cd10b503e2dca09b7a972a613c354e7d