ieee802154: Updated to match nuttx ieee802154 changes

Approved-by: Gregory Nutt <gnutt@nuttx.org>

built-in libc defect workaround: replace '%6.6u' format with an equivalent '%06u'

Approved-by: Gregory Nutt <gnutt@nuttx.org>

Adds a test program for the XBox One controller driver (xbc_test).

Approved-by: Gregory Nutt <gnutt@nuttx.org>

netutils/netlib:  Add one wireless IOCTL wrapper.  For now, this is just a test to be sure that the wireless IOCTL definitions are in place.

apps/examples/usbterm:  Removed because it is not very useful and because it can be configured to use an illegal call into the OS.

apps/examples/hidkbd:  Remove call to arch_usbhost_initialize().  That is violation of the OS interfacing rules and will no longer be supported.  USB host should be initialized as part of the normal board bring-up logic as with any other devices and should not involve illegal calls from applications into the OS.

Add missed dependency

Approved-by: Gregory Nutt

NSH library: In nsh_argexand(), if CONFIG_NSH_ARGCAT is defined but CONFIG_NSH_CMDPARMS defined and/or CONFIG_DISABLE_ENVIRON not defined, then there is a situation that causes an infinite loop in the parser.  Noted by Freddie Chopin.

Signed-off-by: Anton D. Kachalov <mouse@yandex-team.ru>

increase number of supported PWM channels from 4 to 6

Approved-by: Gregory Nutt

Merged in w8jcik/apps/w8jcik/the-config_netutils_httpd_path-constant--1488710144755 (pull request #65)

Missing NETUTILS_HTTPD_PATH added to Kconfig

Approved-by: Gregory Nutt

The CONFIG_NETUTILS_HTTPD_PATH constant is used by httpd_mmap.c and httpd_sendfile.c but It was not present in Kconfig menu.