logd: switch to unordered_map from BasicHashtable

(charry pick from commit 511338dd575572d567c04d69eaea60627b6c3452)

BasicHashtable is relatively untested, move over to
a C++ template library that has more bake time.

Bug: 20419786
Bug: 21590652
Bug: 20500228
Change-Id: I926aaecdc8345eca75c08fdd561b0473504c5d95
3 files changed
tree: c1d781dd74bd5249923ded8ffe02c3c86ea3351a
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/