CI: switch travis to sudo-required (#22986)

Author: vtjnash

.travis.yml

@@ -1,5 +1,5 @@
 language: cpp
-sudo: false
+sudo: required
 dist: trusty
 matrix:
   include:
@@ -58,8 +58,11 @@ before_install:
         contrib/travis_fastfail.sh || exit 1;
         gcc --version;
         BAR="bar -i 30";
-        BUILDOPTS="-j3 VERBOSE=1 FORCE_ASSERTIONS=1 LLVM_ASSERTIONS=1";
+        BUILDOPTS="-j5 VERBOSE=1 FORCE_ASSERTIONS=1 LLVM_ASSERTIONS=1";
         echo "override ARCH=$ARCH" >> Make.user;
+        sudo sh -c "echo 0 > /proc/sys/net/ipv6/conf/lo/disable_ipv6";
+        export JULIA_CPU_CORES=4;
+        export JULIA_TEST_MAXRSS_MB=1200;
         TESTSTORUN="all";
       elif [ `uname` = "Darwin" ]; then
         brew update;
@@ -81,6 +84,8 @@ before_install:
         export JULIA_MACOS_SPAWN="DYLD_FALLBACK_LIBRARY_PATH=\"$DYLD_FALLBACK_LIBRARY_PATH\" \$1";
         export BUILDOPTS="$BUILDOPTS spawn=\$(JULIA_MACOS_SPAWN)";
         make $BUILDOPTS -C contrib -f repackage_system_suitesparse4.make;
+        export JULIA_CPU_CORES=2;
+        export JULIA_TEST_MAXRSS_MB=600;
         TESTSTORUN="all --skip linalg/triangular subarray"; fi # TODO: re enable these if possible without timing out
     - git clone -q git://git.kitenet.net/moreutils
 script:
@@ -119,9 +124,8 @@ script:
         /tmp/julia/bin/julia-debug --precompiled=no -e 'true'
     - /tmp/julia/bin/julia -e 'versioninfo()'
     - pushd /tmp/julia/share/julia/test
-    - export JULIA_CPU_CORES=2 && export JULIA_TEST_MAXRSS_MB=600 &&
-        /tmp/julia/bin/julia --check-bounds=yes runtests.jl $TESTSTORUN &&
-        /tmp/julia/bin/julia --check-bounds=yes runtests.jl libgit2-online download pkg
+    - /tmp/julia/bin/julia --check-bounds=yes runtests.jl $TESTSTORUN &&
+      /tmp/julia/bin/julia --check-bounds=yes runtests.jl libgit2-online download pkg
     - popd
     # test that the embedding code works on our installation
     - mkdir /tmp/embedding-test &&