SAIO probe tests fail if /var/cache/swift* directories don't exist

[Shaun Murakami]

recent changes in the probe tests, i.e. stop probe test if 'resetswift' script fails (perhaps this commit: https://review.openstack.org/gitweb?p=openstack/swift.git;a=commitdiff;h=95a5a4a7ec1ec8a48db756121e7b3440f5704536)

line 21 of resetswift (http://git.openstack.org/cgit/openstack/swift/tree/doc/saio/bin/resetswift) throws an error (exits with exit code 1) if the 'find' command fails to find any /var/cache/swift* directories.

As a fix, I propose wrapping it with an if statement:

if [ $(find /var/cache -type d -name "swift*" 2>/dev/null | wc -l ) != "0" ] ; then
    sudo find /var/cache/swift* -type f -name *.recon -exec rm -f {} \;
fi

In addition, assuming the script is being run as the swift user, 'sudo' should be used with the find command.