KTU84Q
build: Store the jenkins build number in misc_info

If the jenkins build number is available, list it as build_number in
the misc_info.txt file.

Change-Id: I6500c6b53661f2904dff738d25d8a8d24a7dca80
Merge remote-tracking branch 'aosp/kitkat-mr2.2-release' into kk
Merge branch 'kk' of https://github.com/CarbonDev/android_build into opt