fix(provtest): give makedns a name it can resolve for this machine

makedns looks up the server of each zone it writes and qualifies it with
site.domain. On a cluster whose networks name their server as
<xcatmaster> that name is this machine's own, inside the fixture's
domain, which nothing resolves -- so makedns failed and every wire case
died in setup. It passed where the other networks name no server and the
lookup fell back to site.nameservers, an address.

Add the qualified name to /etc/hosts, which teardown already restores.

xCAT-test/autotest/testcase/provtest/provfixture.sh

@@ -461,6 +461,19 @@ define_node() {
     echo "$name" >> "$STATE/nodes"
 }
 
+# This machine's own name under the fixture's domain, resolvable. Only the
+# qualified name is added: the short one is whatever the machine already
+# answers to, and shadowing it would change what every other lookup returns.
+mn_hosts_entry() {
+    local short addr
+    short=$(hostname -s) || die "cannot read this machine's hostname"
+    addr=$(getent ahostsv4 "$(hostname)" 2>/dev/null | awk '{print $1; exit}')
+    [ -n "$addr" ] || addr=$(hostname -I 2>/dev/null | awk '{print $1}')
+    [ -n "$addr" ] || die "cannot find an address for $short"
+    printf '%s %s.%s\n' "$addr" "$short" "$DOMAIN" >> /etc/hosts \
+        || die "cannot add $short.$DOMAIN to /etc/hosts"
+}
+
 do_setup() {
     local tmpl http dns tftp
     # A second setup over a live fixture would overwrite the record teardown
@@ -580,6 +593,13 @@ do_setup() {
         || die "makehosts failed"
     echo done > "$STATE/hostsadded"
 
+    # makedns names each zone's server and qualifies it with site.domain, so on
+    # a cluster whose networks name theirs as <xcatmaster> the name it looks up
+    # is this machine's own, inside the fixture's domain -- which nothing
+    # resolves, and makedns fails before writing a record. Give it that name.
+    # /etc/hosts is saved above and put back by teardown.
+    mn_hosts_entry || return 1
+
     do_generate || return 1
 
     say "fixture is up on $IF_SRV/$IF_CLI, node $NODE at $NODE_IP"