Tests: removed proxy prerequisite from grpc tests.

grpc.t

diff --git a/grpc.t b/grpc.t
index 96de557..0e71b32 100644
--- a/grpc.t
+++ b/grpc.t
@@ -23,7 +23,7 @@
 select STDERR; $| = 1;
 select STDOUT; $| = 1;
 
-my $t = Test::Nginx->new()->has(qw/http proxy rewrite http_v2 grpc/)
+my $t = Test::Nginx->new()->has(qw/http rewrite http_v2 grpc/)
 	->has(qw/upstream_keepalive/);
 
 $t->write_file_expand('nginx.conf', <<'EOF');

grpc_ssl.t

diff --git a/grpc_ssl.t b/grpc_ssl.t
index 6be1e4e..77027e8 100644
--- a/grpc_ssl.t
+++ b/grpc_ssl.t
@@ -23,7 +23,7 @@
 select STDERR; $| = 1;
 select STDOUT; $| = 1;
 
-my $t = Test::Nginx->new()->has(qw/http proxy rewrite http_v2 grpc/)
+my $t = Test::Nginx->new()->has(qw/http rewrite http_v2 grpc/)
 	->has(qw/upstream_keepalive http_ssl/);
 
 $t->{_configure_args} =~ /OpenSSL ([\d\.]+)/;