comms/ebusd: update to v21.1

Bug Fixes
- fix for publishing several MQTT updates at once
- optimized keep alive option for net devices
- fix for duplicate entry "minarbitrationmicros" in HTTP GET
- fix for extra send retry
- fix for newer compiler versions
- fix for potential illegal string usages
- fix for named net device not being resolvable during startup

Features
- added Raspberry Pi docker image
- added support for Cygwin build
- added option to use "\*" as trailing wildcard for circuit and name in MQTT /list topic
- added "--mqttinsecure" option
- updated to newest version of enhanced protocol
- added adapter 3 PIC tool "ebuspicloader" for uploading new firmware and configuring fix IP address

Approved by:	krion
Differential Revision:	https://reviews.freebsd.org/D28112

comms/ebusd/Makefile

@@ -1,7 +1,7 @@
 # $FreeBSD$
 
 PORTNAME=	ebusd
-PORTVERSION=	3.4
+PORTVERSION=	21.1
 DISTVERSIONPREFIX=	v
 CATEGORIES=	comms
 

comms/ebusd/distinfo

@@ -1,3 +1,3 @@
-TIMESTAMP = 1588504293
-SHA256 (john30-ebusd-v3.4_GH0.tar.gz) = 38d69e8687ab98cd6cfcadc6ca1b1949ce29a0efa51f82e3e38777a1f99b28ae
-SIZE (john30-ebusd-v3.4_GH0.tar.gz) = 462066
+TIMESTAMP = 1610442006
+SHA256 (john30-ebusd-v21.1_GH0.tar.gz) = fa880268999c5cd02eb34d9fa83c5c253daf62e3a15a94b6b25e3b8077590189
+SIZE (john30-ebusd-v21.1_GH0.tar.gz) = 492515

comms/ebusd/pkg-plist

@@ -1,6 +1,7 @@
 bin/ebusd
 bin/ebusctl
 bin/ebusfeed
+bin/ebuspicloader
 @dir(%%USER%%,%%GROUP%%,750) %%RUNDIR%%
 @dir(%%USER%%,%%GROUP%%,750) %%LOGDIR%%
 @dir %%ETCDIR%%