diameter: Remove VxWorks
Merge branch 'maint'
Merge branch 'maint'
Merge branch 'maint'
Merge branch 'maint'
Merge branch 'maint'

Conflicts:
	lib/diameter/autoconf/vxworks/sed.general
	xcomp/README.md
Merge branch 'maint'
Merge tag 'OTP_R15B02'

The R15B02 release
Merge branch 'maint'
Merge branch 'maint'
Merge branch 'maint'
Merge branch 'maint'
Merge branch 'maint'
Merge branch 'maint'
Merge branch 'maint'
Merge branch 'maint'
Merge tag 'OTP_R15B03'

The R15B03 release
Add missing error handling clause for handle_request packet return

This should have been included in commit 91a223d3.
Fix timing of service start event

Whether or not it came first was a matter of timing. Originally bungled
in commit 476db530.
Fix setting of T flag at failover

This seems to have been broken at some point before diameter was
included in OTP, prior to R14B03.