Include ping6 in all device builds

ping6 is currently only included in debug builds. Include it
everywhere, now that it doesn't need to be setuid any more.

Bug: 9469682
Change-Id: Ia78f6b0e5fc8f7042fb99cdb4a0add426bb56c7e
Merge "Include ping6 in all device builds"
use ext4 instead of yaffs for the emulator

Bug: https://code.google.com/p/android/issues/detail?id=38561
Change-Id: I7c605457b485d169654263caf55eb7d5a9a60c2e
Merge "use ext4 instead of yaffs for the emulator"
emulator: increase system partition size to 400M

300M is too small.

Change-Id: Icbe4e76d6e5c8a50cc6e6d74e324335bc66b8466
Merge "emulator: increase system partition size to 400M"
emulator: increase system partition to 550M

Yes, 400M isn't enough. I can't believe it either.

Change-Id: I7d3857f04bfda472af6a281017204672bb9c9940
Merge "emulator: increase system partition to 550M"
Allow several system property files

TARGET_SYSTEM_PROP now is a list of files and all of them
are included in the build.prop.

Change-Id: I494f86412b0a299ee4c066e49ab4f4686bc2178a
Merge "Allow several system property files"
Merge branch 'master' of https://android.googlesource.com/platform/build