Use mutex when modifying directory ACLs
Use mutex when modifying directory ACLs

Otherwise there is a race condition between reading the existing ACLs
and writing new ones to disk.

Replace '\' with '_' in mutex name because C# does something weird when
given an actaul path

[#152698533]

Signed-off-by: Sunjay Bhatia <df2d57be7987a471915f625a5499155bc16d4200@pivotal.io>

cloudfoundry/IronFrame,cloudfoundry-incubator/IronFrame,cloudfoundry/IronFrame,cloudfoundry-incubator/IronFrame