add options in swap fstab file

https://docs.puppetlabs.com/references/latest/type.html#mount
fix for issue https://github.com/petems/puppet-swap_file/issues/5
```
options
(Property: This attribute represents concrete state on the target system.)

Mount options for the mounts, as they would appear in the fstab.
```
Update init.pp
Adds spec for the mount's options to default...

To defaults (see #5 for details)
Beaker tests for fstab settings
Merge pull request #8 from petems/swap_fstab_settings

Swap fstab settings