REGTEST: Missing REQUIRE_VERSION declarations.

checks/s00001.vtc needs support for "srvrecord" which came with 1.8 version.
peers/s_basic_sync.vtc and s_tls_basic_sync.vtc need support for "server"
keyword usage in "peers" section which came with 2.0 version.
diff --git a/reg-tests/checks/s00001.vtc b/reg-tests/checks/s00001.vtc
index abb0f2f..2e38867 100644
--- a/reg-tests/checks/s00001.vtc
+++ b/reg-tests/checks/s00001.vtc
@@ -6,6 +6,7 @@
 # The first health-checks passed tests are checked for all these servers
 # thanks to syslog messages.
 
+#REQUIRE_VERSION=1.8
 #EXCLUDE_TARGETS=freebsd
 
 # Note that the first syslog message received is: "Proxy <name> started."