[automerger skipped] minadbd: Support `adb rescue getprop`.
am: 5359d777e6 -s ours
am skip reason: change_id Ic0864ca0fb51505ec1e4f38af2464591aa576201 with SHA1 d8db81a014 is in history

Change-Id: I2c4e8c7af45c56315d9a7e0637813862a9c066b3