Squashed 'external/devlib/' changes from 9a2c4133..86953449

86953449 target/{host,ssh}: Align push/pull with cp/mv behaviour
f23fbd22 target: Use Target._xfer_cache_file() context manager
24e6de67 target: Add Target.{push,pull}(globbing=False) parameter
07bbf902 docs/target: Update Target.{push,pull}() description
590069f0 target: Add Target.makedirs()
bef1ec3a target: Add option delimiter to rm command
0c72763d target/ssh: Fix improper use of os.path.basename()
2129d854 utils/android: Use separate tmp dirs when extracting apk methods
80bddf38 utils/android: Fix xmltree dump for aapt
00f3f5f6 android/background: Specify the device for background cmds
bc9478c3 connection/send_signal: Use signal value instead of name

git-subtree-dir: external/devlib
git-subtree-split: 8695344969a35ebb8df1c9129cf997f37c368e23