PX4-NuttX/nuttx branch test: px4-master_auto_rebase

NuttX:
 - https://github.com/PX4-NuttX/nuttx/tree/px4-master_auto_rebase
 - PX4/NuttX@e61ee7d

Changes from PX4-NuttX/nuttx (PX4/NuttX@d5c12b2) in current PX4/master (dec0387)
PX4/NuttX@d5c12b2...e61ee7d

e61ee7d (HEAD, origin/px4-master_auto_rebase) [PX4: WIP] Fix transmission status handling in the serial interrupt
5f74d4c [PX4: REJECTED] cstdint fix
79ae4c6 [PX4: REJECTED] add math.h
7aea643 [PX4: WIP] Jenkinsfile
a764e4a (origin/master)  drivers/leds/pca9635pw.c configs/stm32f4discovery/src/stm32_pca9635.c: Fix pca9635pw LED driver compilation
1450c0c arch/arm/src/stm32f7/stm32_sdmmc.c:  Fix some missing right parentheses.
6571d4f Update some comments.
078fd78 Merged in raiden00/nuttx (pull request #669)
8416d9a Merged in raiden00/nuttx (pull request #668)
3cd1ccf configs/viewtool-stm32f107/tcpblaster: Configuration modified to use the low-priority work queue.  Actually ALL network configuration should be modified to use the low priority work queue.  It is inappropriate to be performing network operations on the high priority work queue.

Apps:
 - https://github.com/PX4-NuttX/apps/tree/px4-master_auto_rebase
 - PX4/NuttX-apps@444ee16

Changes from PX4-NuttX/apps (PX4/NuttX-apps@36806ba) in current PX4/master (dec0387)
PX4/NuttX-apps@36806ba...444ee16

444ee16 (HEAD -> px4-master_auto_rebase, origin/px4-master_auto_rebase) [REJECTED] add-var-expansion-in-nsh-parse.patch
e66470d (origin/master) Merged in raiden00/apps (pull request #143)
db77b1e apps/examples/tcpblaster:  Fix an error in time calculation.
19b8a52 apps/examples/tcpblaster/tcpblaster_server.c:  Start time was not being initialized on the server side on the first pass through loop so the first output record had a crazy time.
749eccb Squashed commit of the following:
4d8b8fa apps/netutils/dhcpc:  Activates BINDTODEVICE if available, and break up some long lines
0abe341 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.