Tests: aligned generic read timeouts in stream and mail tests.

diff --git a/lib/Test/Nginx/IMAP.pm b/lib/Test/Nginx/IMAP.pm
index 2925324..f2e5b5d 100644
--- a/lib/Test/Nginx/IMAP.pm
+++ b/lib/Test/Nginx/IMAP.pm

@@ -60,7 +60,7 @@
 	my $socket = $self->{_socket};
 	eval {
 		local $SIG{ALRM} = sub { die "timeout\n" };
-		alarm(3);
+		alarm(8);
 		while (<$socket>) {
 			log_in($_);
 			# XXX

diff --git a/lib/Test/Nginx/POP3.pm b/lib/Test/Nginx/POP3.pm
index 39fd450..05310cc 100644
--- a/lib/Test/Nginx/POP3.pm
+++ b/lib/Test/Nginx/POP3.pm

@@ -60,7 +60,7 @@
 	my $socket = $self->{_socket};
 	eval {
 		local $SIG{ALRM} = sub { die "timeout\n" };
-		alarm(3);
+		alarm(8);
 		while (<$socket>) {
 			log_in($_);
 			# XXX

diff --git a/lib/Test/Nginx/SMTP.pm b/lib/Test/Nginx/SMTP.pm
index 1dc9114..c722212 100644
--- a/lib/Test/Nginx/SMTP.pm
+++ b/lib/Test/Nginx/SMTP.pm

@@ -60,7 +60,7 @@
 	my $socket = $self->{_socket};
 	eval {
 		local $SIG{ALRM} = sub { die "timeout\n" };
-		alarm(3);
+		alarm(8);
 		while (<$socket>) {
 			log_in($_);
 			next if m/^\d\d\d-/;

diff --git a/lib/Test/Nginx/Stream.pm b/lib/Test/Nginx/Stream.pm
index b05486b..b5cb81a 100644
--- a/lib/Test/Nginx/Stream.pm
+++ b/lib/Test/Nginx/Stream.pm

@@ -84,7 +84,7 @@
 	$s = $self->{_socket};
 
 	$s->blocking(0);
-	if (IO::Select->new($s)->can_read($extra{read_timeout} || 5)) {
+	if (IO::Select->new($s)->can_read($extra{read_timeout} || 8)) {
 		$s->sysread($buf, 1024);
 	};