[dotnet] target: fix travis.yaml once again

.travis.yml

@@ -1,4 +1,3 @@
-dist: trusty
 sudo: true
 
 language: java
@@ -48,6 +47,7 @@ matrix:
       env: TARGET=csharp
     - os: linux
       jdk: oraclejdk7
+      dist: trusty
       env: TARGET=dotnet
     - os: linux
       jdk: oraclejdk7
@@ -63,7 +63,6 @@ matrix:
       env: TARGET=go
 
 before_install:
-  - ./.travis/before-install-mvn3.3.9-trusty.sh
   - ./.travis/before-install-$TRAVIS_OS_NAME-$TARGET.sh
 
 script:

.travis/before-install-linux-dotnet.sh

@@ -2,9 +2,21 @@
 
 set -euo pipefail
 
+# install dotnet
 sudo sh -c 'echo "deb [arch=amd64] https://apt-mo.trafficmanager.net/repos/dotnet-release/ trusty main" > /etc/apt/sources.list.d/dotnetdev.list'
 sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 417A0893
 sudo apt-get update
 
 sudo apt-get install dotnet-dev-1.0.0-preview2.1-003177
 
+# install mvn
+wget http://apache.mirrors.lucidnetworks.net/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.tar.gz && \
+    wget https://www.apache.org/dist/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.tar.gz.md5 && \
+    echo "$(cat apache-maven-3.3.9-bin.tar.gz.md5)  apache-maven-3.3.9-bin.tar.gz" > apache-maven-3.3.9-bin.tar.gz.md5 && \
+    md5sum -c *.md5
+
+sudo rm -rf /usr/local/maven/ && sudo mkdir -p /usr/local/maven && \
+    sudo tar xzvf apache-maven-3.3.9-bin.tar.gz -C /usr/local/maven --strip-components=1
+
+mvn -v
+

.travis/before-install-mvn3.3.9-trusty.sh

@@ -1,14 +0,0 @@
-#!/bin/sh
-
-set -ex
-
-wget http://apache.mirrors.lucidnetworks.net/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.tar.gz && \
-    wget https://www.apache.org/dist/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.tar.gz.md5 && \
-    echo "$(cat apache-maven-3.3.9-bin.tar.gz.md5)  apache-maven-3.3.9-bin.tar.gz" > apache-maven-3.3.9-bin.tar.gz.md5 && \
-    md5sum -c *.md5
-
-sudo rm -rf /usr/local/maven/ && sudo mkdir -p /usr/local/maven && \
-    sudo tar xzvf apache-maven-3.3.9-bin.tar.gz -C /usr/local/maven --strip-components=1
-
-mvn -v
-