More travis fixes:

Fix compiler name in config_info output generation.
Remove g++7 tests: apparently it's not supported yet.

.travis.yml

@@ -147,33 +147,6 @@ matrix:
           sources:
             - ubuntu-toolchain-r-test
 
-    - os: linux
-      env: TOOLSET=gcc COMPILER=g++-7 CXXSTD=c++11
-      addons:
-        apt:
-          packages:
-            - g++-7
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      env: TOOLSET=gcc COMPILER=g++-7 CXXSTD=c++14
-      addons:
-        apt:
-          packages:
-            - g++-7
-          sources:
-            - ubuntu-toolchain-r-test
-
-    - os: linux
-      env: TOOLSET=gcc COMPILER=g++-7 CXXSTD=c++1z
-      addons:
-        apt:
-          packages:
-            - g++-7
-          sources:
-            - ubuntu-toolchain-r-test
-
     - os: linux
       env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++03
 
@@ -431,7 +404,7 @@ install:
 script:
   - |-
     echo "using $TOOLSET : : $COMPILER : <cxxflags>-std=$CXXSTD ;" > ~/user-config.jam
-  - (cd libs/config/test && ../../../b2 config_info_travis_install msvc && ./config_info_travis)
+  - (cd libs/config/test && ../../../b2 config_info_travis_install toolset=$TOOLSET && ./config_info_travis)
   - ./b2 -j3 libs/config/test toolset=$TOOLSET
 
 notifications: