tree-wide: add SD_ID128_MAKE_STR, remove LOG_MESSAGE_ID

Embedding sd_id128_t's in constant strings was rather cumbersome. We had
SD_ID128_CONST_STR which returned a const char[], but it had two problems:
- it wasn't possible to statically concatanate this array with a normal string
- gcc wasn't really able to optimize this, and generated code to perform the
  "conversion" at runtime.
Because of this, even our own code in coredumpctl wasn't using
SD_ID128_CONST_STR.

Add a new macro to generate a constant string: SD_ID128_MAKE_STR.
It is not as elegant as SD_ID128_CONST_STR, because it requires a repetition
of the numbers, but in practice it is more convenient to use, and allows gcc
to generate smarter code:

$ size .libs/systemd{,-logind,-journald}{.old,}
   text	   data	    bss	    dec	    hex	filename
1265204	 149564	   4808	1419576	 15a938	.libs/systemd.old
1260268	 149564	   4808	1414640	 1595f0	.libs/systemd
 246805	  13852	    209	 260866	  3fb02	.libs/systemd-logind.old
 240973	  13852	    209	 255034	  3e43a	.libs/systemd-logind
 146839	   4984	     34	 151857	  25131	.libs/systemd-journald.old
 146391	   4984	     34	 151409	  24f71	.libs/systemd-journald

It is also much easier to check if a certain binary uses a certain MESSAGE_ID:

$ strings .libs/systemd.old|grep MESSAGE_ID
MESSAGE_ID=%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x
MESSAGE_ID=%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x
MESSAGE_ID=%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x
MESSAGE_ID=%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x

$ strings .libs/systemd|grep MESSAGE_ID
MESSAGE_ID=c7a787079b354eaaa9e77b371893cd27
MESSAGE_ID=b07a249cd024414a82dd00cd181378ff
MESSAGE_ID=641257651c1b4ec9a8624d7a40a9e1e7
MESSAGE_ID=de5b426a63be47a7b6ac3eaac82e2f6f
MESSAGE_ID=d34d037fff1847e6ae669a370e694725
MESSAGE_ID=7d4958e842da4a758f6c1cdc7b36dcc5
MESSAGE_ID=1dee0369c7fc4736b7099b38ecb46ee7
MESSAGE_ID=39f53479d3a045ac8e11786248231fbf
MESSAGE_ID=be02cf6855d2428ba40df7e9d022f03d
MESSAGE_ID=7b05ebc668384222baa8881179cfda54
MESSAGE_ID=9d1aaa27d60140bd96365438aad20286

src/resolve/resolved-dns-server.c

@@ -570,7 +570,7 @@ void dns_server_warn_downgrade(DnsServer *server) {
                 return;
 
         log_struct(LOG_NOTICE,
-                   LOG_MESSAGE_ID(SD_MESSAGE_DNSSEC_DOWNGRADE),
+                   "MESSAGE_ID=" SD_MESSAGE_DNSSEC_DOWNGRADE_STR,
                    LOG_MESSAGE("Server %s does not support DNSSEC, downgrading to non-DNSSEC mode.", dns_server_string(server)),
                    "DNS_SERVER=%s", dns_server_string(server),
                    "DNS_SERVER_FEATURE_LEVEL=%s", dns_server_feature_level_to_string(server->possible_feature_level),

src/resolve/resolved-dns-transaction.c

@@ -318,7 +318,7 @@ void dns_transaction_complete(DnsTransaction *t, DnsTransactionState state) {
                 dns_resource_key_to_string(t->key, key_str, sizeof key_str);
 
                 log_struct(LOG_NOTICE,
-                           LOG_MESSAGE_ID(SD_MESSAGE_DNSSEC_FAILURE),
+                           "MESSAGE_ID=" SD_MESSAGE_DNSSEC_FAILURE_STR,
                            LOG_MESSAGE("DNSSEC validation failed for question %s: %s", key_str, dnssec_result_to_string(t->answer_dnssec_result)),
                            "DNS_TRANSACTION=%" PRIu16, t->id,
                            "DNS_QUESTION=%s", key_str,

src/resolve/resolved-dns-trust-anchor.c

@@ -594,7 +594,7 @@ static int dns_trust_anchor_remove_revoked(DnsTrustAnchor *d, DnsResourceRecord
 
         /* We found the key! Warn the user */
         log_struct(LOG_WARNING,
-                   LOG_MESSAGE_ID(SD_MESSAGE_DNSSEC_TRUST_ANCHOR_REVOKED),
+                   "MESSAGE_ID=" SD_MESSAGE_DNSSEC_TRUST_ANCHOR_REVOKED_STR,
                    LOG_MESSAGE("DNSSEC Trust anchor %s has been revoked. Please update the trust anchor, or upgrade your operating system."), strna(dns_resource_record_to_string(rr)),
                    "TRUST_ANCHOR=%s", dns_resource_record_to_string(rr),
                    NULL);