tests/test-snapd-service: fix shellcheck issues

[bboozzoo]

Fix issues raised by shellcheck 0.4.6:

In tests/lib/snaps/test-snapd-service/bin/start line 2:
snapctl get service-option > $SNAP_DATA/service-option
^-- SC2086: Double quote to prevent globbing and word splitting.

In tests/lib/snaps/test-snapd-service/bin/start-other line 2:
snapctl get service-option > $SNAP_DATA/service-option
^-- SC2086: Double quote to prevent globbing and word splitting.

In tests/lib/snaps/test-snapd-service/meta/hooks/configure line 3:
snapctl set service-option=$(snapctl get service-option-source)
^-- SC2046: Quote this to prevent word splitting.

Signed-off-by: Maciej Borzecki maciej.zenon.borzecki@canonical.com

[zyga]

Looks good, LGTM

[codecov-io]

Codecov Report

Merging #4119 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4119   +/-   ##
=======================================
  Coverage   75.61%   75.61%           
=======================================
  Files         435      435           
  Lines       37596    37596           
=======================================
  Hits        28430    28430           
  Misses       7175     7175           
  Partials     1991     1991

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