PX4-NuttX/nuttx branch test: px4-master_auto_rebase

NuttX:
 - https://github.com/PX4-NuttX/nuttx/tree/px4-master_auto_rebase
 - PX4/NuttX@9a1fb02

Changes from PX4-NuttX/nuttx (PX4/NuttX@6377532) in current PX4/master (aa270fc)
PX4/NuttX@6377532...9a1fb02

9a1fb02 (HEAD, origin/px4-master_auto_rebase) [PX4: WIP] Fix transmission status handling in the serial interrupt
a9a0570 [PX4: REJECTED] cstdint fix
0ce3d20 [PX4: REJECTED] add math.h
22ef6cc [PX4: WIP] Jenkinsfile
fe592d5 (origin/master) include/limits.h:  Fix a signed-ness error introduced in a recent commit.  Documentation/:  Update acronym list.
34aeb08 Documentation/:  Remove some old, early prototype NuttX logo images.
1acfac3 net/:  More fixes to wrong comments from old change from the interrupt driven network to the work-queue driven network.
aabdc00 net/:  Fix some incorrect comments that go back for years (but have also been cloned in newer files).  The network was once interrupt driver, but now runs on the work queue with a semaphore to enforce mutual exclusion.
a0e169a net/:  Fix a sixlowpan typo bug recently introduced;  Rename g_ipv6_allzeroaddre with the more meaning g_ipv6_unspecaddr since the all-zero address is the IPv6 unspecified address (sometime IN6_ADDR_ANY).  Remove more inline tests for IPv6 multicast with tcommint net_is_addr_mcast() macro.  Update some comments.
5bb216f net/:  There are many different checks for IPv6 multicast addresses.  Most of the checks are different.  RFC 3513 clearly specifies how to detect an IPv6 multilcast address:  they should begin with 0xffxx.  I did not change some of the checks in ipv6_input.c, however.  In that file, the comments indicate that the code should only pick of certain mulicast address that begin withi 0xff02.

Apps:
 - https://github.com/PX4-NuttX/apps/tree/px4-master_auto_rebase
 - PX4/NuttX-apps@80e0cb8

Changes from PX4-NuttX/apps (PX4/NuttX-apps@36806ba) in current PX4/master (aa270fc)
PX4/NuttX-apps@36806ba...80e0cb8

80e0cb8 (HEAD -> px4-master_auto_rebase, origin/px4-master_auto_rebase) [REJECTED] add-var-expansion-in-nsh-parse.patch
0abe341 (origin/master) Merged in raiden00/apps (pull request #142)
3403b1b apps/nshlib/README.txt:  Clarify arguments to the mkrd command.
abcb66c Remove apps/interpreters/micropthon.  There are several reasons for this.  (1) the current version 1.3.8 is very old and no one is supporting it.  (2) the port only includes the core micropython logic and none of the Python libraries.  As such it is useless in any real application.  (3) There have recently been compile failures reported.  It looks like this is due to changes in newlib based toolchains that now bring in incompatible newlib header files.  See issue 104 at https://bitbucket.org/nuttx/nuttx/issues/104/build-micropython-138-error.  With no one dedicated to the support of micropython, it can no longer be carried in the NuttX apps/ repository.
36d6348 apps/nslib:  Try to eliminate and uninitialized variable warning.
e853fb4 apps/wireless/wapi:  Remove dependency on CONFIG_EXPERIMENTAL from Kconfig
133f239 Merged in raiden00/apps (pull request #141)
e4a30d5 apps/Make.defs:  Simplify last fix
bf23277 apps/Make.defs:  Fix an error introduced with recent chagne.  MKKCONFIG may not be defined resulting in failure to create apps/Kconfig.
36e04b3 apps/examples/gps:  Add GPS example using MINMEA lib