execution time of some functional tests increased considerably

[devimc]

After build and install hyperstart using last commit (9bf5e1b) I noticed that execution time of some functional tests increased considerably for example:

$ prove -v exec.bats
exec.bats .. 
1..6
ok 1 modifying a container with exec
ok 2 exec a container with privileges
ok 3 copying file from host to container using exec
ok 4 stdout forwarded using exec
ok 5 stderr forwarded using exec
ok 6 check exit code using exec
ok
All tests successful.
Files=1, Tests=6, 206 wallclock secs ( 0.02 usr  0.00 sys +  0.76 cusr  0.45 csys =  1.23 CPU)
Result: PASS

[dlespiau]

/cc @rbradford