REGTESTS: Remove REQUIRE_VERSION=1.8 from all tests

HAProxy 1.8 is the lowest supported version, thus this always matches.

see 1b095cac9468d0c3eeb157e9b1a2947487bd3c83
diff --git a/reg-tests/checks/agent-check.vtc b/reg-tests/checks/agent-check.vtc
index 2744a62..5cf51c6 100644
--- a/reg-tests/checks/agent-check.vtc
+++ b/reg-tests/checks/agent-check.vtc
@@ -1,5 +1,4 @@
 varnishtest "Health-checks: agent-check"
-#REQUIRE_VERSION=1.8
 #REGTEST_TYPE=slow
 feature ignore_unknown_macro
 
diff --git a/reg-tests/seamless-reload/abns_socket.vtc b/reg-tests/seamless-reload/abns_socket.vtc
index 2ea8dd3..ce1b156 100644
--- a/reg-tests/seamless-reload/abns_socket.vtc
+++ b/reg-tests/seamless-reload/abns_socket.vtc
@@ -19,7 +19,6 @@
 
 # abns@ sockets are not available on freebsd
 #EXCLUDE_TARGETS=freebsd,osx,generic
-#REQUIRE_VERSION=1.8
 #REGTEST_TYPE=broken
 
 haproxy h1 -W -conf {
diff --git a/reg-tests/server/cli_set_fdqn.vtc b/reg-tests/server/cli_set_fdqn.vtc
index 3055f76..86f32b6 100644
--- a/reg-tests/server/cli_set_fdqn.vtc
+++ b/reg-tests/server/cli_set_fdqn.vtc
@@ -3,7 +3,6 @@
 feature ignore_unknown_macro
 
 # for "set server <srv> fqdn"
-#REQUIRE_VERSION=1.8
 #REGTEST_TYPE=bug
 
 # Do nothing. Is there only to create s1_* macros