Detect TPM "Policy-OR" criteria from .ski file (remove "policy OR" command line option for kmyth-unseal)

[bit-bender]

The Feature/add policy or for authorization pull request (PR #166) added the capability to TPM seal data that can be TPM unsealed if the policy digest matches one of two possible criteria (policy-OR). When unsealing, however, the user must currently specify the -p (policy OR) flag. As the existence of a policy OR criteria should be easily detectable when parsing/reading the input .ski file, however, the user should not have to specify this as a command line option. Instead, kmyth-unseal should just apply whatever authorization criteria is specified in the .ski file, including a policy OR criteria.