android/hal-audio: Workaround AudioFlinger issues

Audio HAL code calculates accurate input stream buffer size which
allows to fill media packets with as much data as possible. However,
in most cases calculated buffer size does not work well with Android
audio code which causes glitches when playing simultaneously to
different audio output (like notification) or crashes mediaserver
when disconnecting with headset.

This patch changes input buffer size to fixed magic value 20*512 which
is used in Bluedroid Audio HAL. Such change requires that we need to
drop assumption that each input buffer can be used to fill exactly one
media packet and need to use it to fill multiple media packets. To
avoid buffering in Audio HAL, we allow that last media packet can be
filled in non-optimal way, i.e. has less data that can fit.
[travis-ci] Add configuration file
android: Fix GNU old-style struct field designator

This gives a warning on clang, that turns into an error due to -Werror.
android/tester: Fix crash on failure inside setup()

The various setup_* functions were still continuing even though setup()
failed and did not initialize data->if_bluetooth properly.

Also do a little refactoring by moving tester_setup_failed() calls to
the setup() callers, so they stay close to the other failure points and
not hidden deep into a helper function.

Crash detected by Valgrind:

==4959== Invalid read of size 4
==4959==    at 0x805967A: setup_base (android-tester.c:2029)
==4959==    by 0x8055541: setup_callback (tester.c:373)
==4959==    by 0x408348F: g_idle_dispatch (gmain.c:5250)
==4959==    by 0x4086A75: g_main_context_dispatch (gmain.c:3065)
==4959==    by 0x4086E14: g_main_context_iterate.isra.23 (gmain.c:3712)
==4959==    by 0x40872FA: g_main_loop_run (gmain.c:3906)
==4959==    by 0x41744D2: (below main) (libc-start.c:226)
==4959==  Address 0x4 is not stack'd, malloc'd or (recently) free'd
android: Remove useless extra parenthesis
android: Trivial replacement of tabs where spaces are expected
emulator: Fix crash if socket(AF_ALG) is not support by the kernel

On this situation, smp_stop() was being called with NULL pointer.

Crash detected by valgrind:

==7925== Invalid read of size 4
==7925==    at 0x8052F18: smp_stop (smp.c:480)
==7925==    by 0x8052542: bthost_stop (bthost.c:2073)
==7925==    by 0x805521D: hciemu_unref (hciemu.c:372)
==7925==    by 0x8058C65: test_post_teardown (android-tester.c:464)
==7925==    by 0x8055DE7: tester_teardown_complete (tester.c:533)
==7925==    by 0x8055501: teardown_callback (tester.c:312)
==7925==    by 0x408348F: g_idle_dispatch (gmain.c:5250)
==7925==    by 0x4086A75: g_main_context_dispatch (gmain.c:3065)
==7925==    by 0x4086E14: g_main_context_iterate.isra.23 (gmain.c:3712)
==7925==    by 0x40872FA: g_main_loop_run (gmain.c:3906)
==7925==    by 0x41744D2: (below main) (libc-start.c:226)
==7925==  Address 0x8 is not stack'd, malloc'd or (recently) free'd