add missing space for cafrun -w option

[LaHaine]

This calls mpiexec -v

Avg response time	coverage on master

Summary of changes

This is a trivial change that fixes the cafrun wrapper script if called with -w or --wraps option.

Summarize what you changed
I have added one space

Rationale for changes

cafrun -w produced this error:
cafrun: line 80: /opt/ohpc/pub/mpi/openmpi-gnu/1.10.6/bin/mpiexec-v: No such file or directory

Additional info and certifications

This pull request (PR) is a:

• Bug fix
• Feature addition
• Other, Please describe:

I certify that:

• I have reviewed the contributing guidelines
• If this PR is a work in progress I have added WIP: to the
  beginning of the PR title
• If this PR is problematic for any reason, I have added
  DO NOT MERGE: to the beginning of the title
• The branch name and title of this PR contains the text
  issue-<#> where <#> is replaced by the issue that this PR
  is addressing
• I have deleted trailing white space on any lines that this PR
  touches
• I have used spaces for indentation on any lines that this PR
  touches
• I have included some comments to explain non-obvious code
  changes
• I have run the tests localy (ctest) and all tests pass
• Each commit is a logically atomic, self-consistent, cohesive
  set of changes
• The commit message should follow these guidelines:
  • First line is directive phrase, starting with a capitalized
    imperative verb, and is no longer than 50 characters
    summarizing your commit
  • Next line, if necessary is blank
  • Following lines are all wrapped at 72 characters and can
    include additional paragraphs, bulleted lists, etc.
  • Use Github keywords where appropriate, to indicate the
    commit resolves an open issue.
• I have signed Contributor License Agreement (CLA) by
  clicking the "details" link to the right of the licence/cla
  check and following the directions on the CLA assistant webpage
• I have ensured that the test coverage hasn't gone down and added new unit tests to cover an new code added to the library

For contributors and SI team members with code review priviledges

• I certify that I will wait 24 hours before self-approving via
  pullapprove comment or Github code review so that someone
  else has the chance to review my proposed changes

[codecov]

Codecov Report

Merging #383 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #383   +/-   ##
======================================
  Coverage    39.3%   39.3%           
======================================
  Files           3       3           
  Lines        1707    1707           
  Branches      294     294           
======================================
  Hits          671     671           
  Misses        937     937           
  Partials       99      99

[zbeekman]

@LaHaine Thanks for catching this. I'm actually in the process of refactoring the caf and cafrun scripts, so I'll probably close this PR and incorporate your changes (or an alternate version) manually.

Thanks!

[zbeekman]

Fixed on one of my branches, merging upstream to master soonish