[ADAM-1154] Change set -x to set -e in ./bin/adam-shell.

[fnothaft]

Resolves #1154.

[AmplabJenkins]

Test FAILed.
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Build result: FAILURE

[...truncated 32 lines...]Triggering ADAM-prb ? 2.6.0,2.11,1.3.1,centosTriggering ADAM-prb ? 2.3.0,2.11,1.4.1,centosTriggering ADAM-prb ? 2.6.0,2.11,2.0.0,centosTriggering ADAM-prb ? 2.3.0,2.10,1.4.1,centosTriggering ADAM-prb ? 2.6.0,2.11,1.6.1,centosADAM-prb ? 2.3.0,2.11,1.5.2,centos completed with result SUCCESSADAM-prb ? 2.3.0,2.10,1.5.2,centos completed with result SUCCESSADAM-prb ? 2.3.0,2.10,2.0.0,centos completed with result FAILUREADAM-prb ? 2.6.0,2.10,1.4.1,centos completed with result SUCCESSADAM-prb ? 2.6.0,2.10,1.6.1,centos completed with result SUCCESSADAM-prb ? 2.6.0,2.10,2.0.0,centos completed with result FAILUREADAM-prb ? 2.6.0,2.11,1.4.1,centos completed with result SUCCESSADAM-prb ? 2.3.0,2.10,1.3.1,centos completed with result SUCCESSADAM-prb ? 2.6.0,2.10,1.3.1,centos completed with result SUCCESSADAM-prb ? 2.3.0,2.11,1.6.1,centos completed with result SUCCESSADAM-prb ? 2.3.0,2.11,1.3.1,centos completed with result SUCCESSADAM-prb ? 2.3.0,2.11,2.0.0,centos completed with result FAILUREADAM-prb ? 2.3.0,2.10,1.6.1,centos completed with result SUCCESSADAM-prb ? 2.6.0,2.11,1.3.1,centos completed with result SUCCESSADAM-prb ? 2.3.0,2.11,1.4.1,centos completed with result SUCCESSADAM-prb ? 2.6.0,2.11,2.0.0,centos completed with result FAILUREADAM-prb ? 2.3.0,2.10,1.4.1,centos completed with result SUCCESSADAM-prb ? 2.6.0,2.11,1.6.1,centos completed with result SUCCESSNotifying endpoint 'HTTP:https://webhooks.gitter.im/e/ac8bb6e9f53357bc8aa8'
Test FAILed.

[fnothaft]

This is failing the 2.0.0 tests, which will fail until #1123 merges.

[heuermh]

Jenkins, retest this please.

[AmplabJenkins]

Test PASSed.
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Test PASSed.

[heuermh]

Merged as commit ae86092.

Thank you, @fnothaft!