NCAR / manage_externals / 69

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travis-ci

Add info to error message.

Add info to the error message when the configuration file could not be found.
Suggests that the user verify they ran from the root of the source tree.

Testing:
    make test - python2/3 - pass, 1 skip
    manual testing - escomp/cesm, clm-demo - ok

558 of 618 branches covered (90.29%)

Branch coverage included in aggregate %.

1852 of 1960 relevant lines covered (94.49%)

2.36 hits per line