hostnamed: introduce new "embedded" chassis type

We really don't want to get lost in adding fridge, car, plane, drone, or
whatever else, hence add a generic term "embedded" cover all the cases
where the computer is just part of something bigger, and not at the
focus of things.

(cherry picked from commit 25fa306ed5)

man/hostnamectl.xml

@@ -217,7 +217,8 @@
                                 <literal>server</literal>,
                                 <literal>tablet</literal>,
                                 <literal>handset</literal>,
-                                <literal>watch</literal>, as well as
+                                <literal>watch</literal>,
+                                <literal>embedded</literal> as well as
                                 the special chassis types
                                 <literal>vm</literal> and
                                 <literal>container</literal> for

shell-completion/bash/hostnamectl

@@ -52,7 +52,7 @@ _hostnamectl() {
         if [[ -z $verb ]]; then
                 comps=${VERBS[*]}
         elif __contains_word "$verb" ${VERBS[CHASSIS]}; then
-                comps='desktop laptop server tablet handset watch vm container'
+                comps='desktop laptop server tablet handset watch embedded vm container'
         elif __contains_word "$verb" ${VERBS[STANDALONE]} ${VERBS[ICONS]} ${VERBS[NAME]}; then
                 comps=''
         fi

shell-completion/zsh/_hostnamectl

@@ -18,7 +18,7 @@ _hostnamectl_set-icon-name() {
 
 _hostnamectl_set-chassis() {
     if (( CURRENT <= 3 )); then
-        _chassis=( desktop laptop server tablet handset watch vm container )
+        _chassis=( desktop laptop server tablet handset watch embedded vm container )
         _describe chassis _chassis
     else
         _message "no more options"

src/hostname/hostnamed.c

@@ -138,7 +138,8 @@ static bool valid_chassis(const char *chassis) {
                         "server\0"
                         "tablet\0"
                         "handset\0"
-                        "watch\0",
+                        "watch\0"
+                        "embedded\0",
                         chassis);
 }