Fixed host count into 3(align with grpc-blob)

Test result: https://paste.googleplex.com/6300373870182400?raw

Google-Bug-Id: 433414984
Change-Id: I261e47cc00b1dc6b2031c4cdb98cb756aa6cccc1
Signed-off-by: Jack Huang <huangweichieh@google.com>
5 files changed