ALLJOYN-1973: Remove Android NDK conditionals from SConscript files.

Change-Id: Ibc24e73deff526cf1fcd766b1b1171539d1cef92
ALLJOYN-2315: Fix build of stand-alone common unit tests.

Change-Id: Ib7fa3cdb7b6adde3b32966a87d4a5363446eb5a9
Exit with a fail code from SCons files in the case of an error.

Change-Id: I651a79c0ae2b96f7028d9f7143953aca9cee9286
ALLJOYN-1654 Android debug level are inappropriate

In AllJoyn the High level debug is used as a standard debug message
and does not signify a warning. The high level debug has been changed
from android WARNING to INFO.  The Standard level debug has been changed
from android INFO to DEBUG.  The AllJoyn Trace level debug had been
changed from android DEBUG to VERBOSE.  These level changes match more
closely with proper level used internally by Android.

Change one error message from error to high level debug.  Since this
error is expected when using the bundled daemon and should not print
out an error.

Change-Id: I3c02a0b4560a8ae3dd17afedb53866d6b727e81f
ALLJOYN-1973 Must define GTEST_OS_LINUX_ANDROID for unit tests

GTEST_OS_LINUX_ANDROID must be defined for the when building the google
test or we get a compilation error reported from the function wcscasecmp
is encountered.

Change-Id: I11e5bce5cf35e163f799962096fc1eac99e68918