Consul doesn't verify TLS certificates against revocation list

### `consul version` for both Client and Server
Client: `0.7.1`
Server: `0.7.1`

### `consul info` for both Client and Server
### Reproduction steps
-Configure Consul with TLS with all verification options on, using a certificate which contains a reference to a valid CRL.
-Start Consul and verify that everything works
-Revoke one of the certs and update CRL
-Start consul again

### Expected behavior:
Consul should verify certs against the CRL in intervals (since servers may be running for years) and deny traffic to/from agents using revoked certs

### Observed behavior:
Consul happily accepts traffic from a revoked certificate, and allows usage of expired certificates locally.

The issue names no source file, test, or entry point. Start by reproducing the TLS setup with a certificate referencing a CRL, revoke a certificate, update the CRL, and restart Consul. Done means revoked certificates are rejected and certificate revocation is rechecked while long-running agents operate.

Written by the indexing model from the issue text.