Repair check of logbindir
Repair check of logbindir

Presumably the intention was to check that it is *both* not relative
and not already managed.

After update to 10.8 the mysql module tries and fails to manage '.'
on nodes where i have log-bin set to a relative path.

simp/puppetlabs-mysql,markasammut/puppetlabs-mysql,puppetlabs/puppetlabs-mysql,markasammut/puppetlabs-mysql,simp/puppetlabs-mysql,puppetlabs/puppetlabs-mysql