Fix to escape % character in systemd config for raid0Mounts

[cndbain]

Systemd in newer versions of CoreOS disallows unknown % characters in config files. Escape the % character used to configure raid0Mounts.

Fixes #1525

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[cndbain]

Signed CLA

[cndbain]

/assign @danielfm

[danielfm]

/lgtm

[codecov-io]

Codecov Report

Merging #1526 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1526   +/-   ##
=======================================
  Coverage   25.46%   25.46%           
=======================================
  Files          97       97           
  Lines        5003     5003           
=======================================
  Hits         1274     1274           
  Misses       3582     3582           
  Partials      147      147

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[danielfm]

/approve

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This pull-request has been approved by: danielfm

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[danielfm]

Thanks for your contribution @cndbain!