travis: do not run coverage, tip tests in v3.4

Signed-off-by: Gyuho Lee <leegyuho@amazon.com>

.travis.yml

@@ -7,7 +7,6 @@ services: docker
 
 go:
 - 1.12.7
-- tip
 
 notifications:
   on_success: never
@@ -23,8 +22,6 @@ env:
   - TARGET=linux-amd64-unit
   - TARGET=all-build
   - TARGET=linux-amd64-grpcproxy
-  - TARGET=linux-amd64-coverage
-  - TARGET=linux-amd64-fmt-unit-go-tip
   - TARGET=linux-386-unit
 
 matrix:
@@ -34,35 +31,8 @@ matrix:
     env: TARGET=linux-amd64-integration-4-cpu
   - go: 1.12.7
     env: TARGET=linux-amd64-grpcproxy
-  - go: 1.12.7
-    env: TARGET=linux-amd64-coverage
-  - go: tip
-    env: TARGET=linux-amd64-fmt-unit-go-tip
   - go: 1.12.7
     env: TARGET=linux-386-unit
-  exclude:
-  - go: tip
-    env: TARGET=linux-amd64-fmt
-  - go: tip
-    env: TARGET=linux-amd64-integration-1-cpu
-  - go: tip
-    env: TARGET=linux-amd64-integration-2-cpu
-  - go: tip
-    env: TARGET=linux-amd64-integration-4-cpu
-  - go: tip
-    env: TARGET=linux-amd64-functional
-  - go: tip
-    env: TARGET=linux-amd64-unit
-  - go: tip
-    env: TARGET=all-build
-  - go: tip
-    env: TARGET=linux-amd64-grpcproxy
-  - go: tip
-    env: TARGET=linux-amd64-coverage
-  - go: 1.12.7
-    env: TARGET=linux-amd64-fmt-unit-go-tip
-  - go: tip
-    env: TARGET=linux-386-unit
 
 before_install:
 - if [[ $TRAVIS_GO_VERSION == 1.* ]]; then docker pull gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION}; fi
@@ -118,12 +88,6 @@ script:
       linux-amd64-grpcproxy)
         sudo HOST_TMP_DIR=/tmp TEST_OPTS="PASSES='build grpcproxy'" make docker-test
         ;;
-      linux-amd64-coverage)
-        sudo HOST_TMP_DIR=/tmp make docker-test-coverage
-        ;;
-      linux-amd64-fmt-unit-go-tip)
-        GOARCH=amd64 PASSES='fmt unit' ./test
-        ;;
       linux-386-unit)
         docker run --rm \
           --volume=`pwd`:/go/src/go.etcd.io/etcd gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION} \