Upstream fixed ipv6 problem, remove write hosts step

Author: yidongnan

.github/workflows/build-master.yml

@@ -15,23 +15,6 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      # https://github.com/actions/virtual-environments/issues/929
-      - name: "Setup /etc/hosts for Linux"
-        shell: bash
-        run: |
-          if [ `uname` = "Linux" ]; then
-            echo "\$ cat /etc/hosts"
-            cat /etc/hosts
-            echo
-            (
-              echo "127.0.0.1       localhost";
-              echo "::1     localhost ip6-localhost ip6-loopback";
-            ) | sudo tee /etc/hosts
-            echo
-            echo "\$ cat /etc/hosts"
-            cat /etc/hosts
-          fi
-
       - name: Set up java ${{ matrix.java }}
         uses: actions/setup-java@v1
         with:

.github/workflows/pull-request.yml

@@ -12,23 +12,6 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      # https://github.com/actions/virtual-environments/issues/929
-      - name: "Setup /etc/hosts for Linux"
-        shell: bash
-        run: |
-          if [ `uname` = "Linux" ]; then
-            echo "\$ cat /etc/hosts"
-            cat /etc/hosts
-            echo
-            (
-              echo "127.0.0.1       localhost";
-              echo "::1     localhost ip6-localhost ip6-loopback";
-            ) | sudo tee /etc/hosts
-            echo
-            echo "\$ cat /etc/hosts"
-            cat /etc/hosts
-          fi
-
       - name: Set up java ${{ matrix.java }}
         uses: actions/setup-java@v1
         with: