Log Message:
Update security/vault to 0.7.2.

0.7.2 (May 8th, 2017)

BUG FIXES:

- audit: Fix auditing entries containing certain kinds of time values

0.7.1 (May 5th, 2017)

DEPRECATIONS/CHANGES:

- LDAP Auth Backend: Group membership queries will now run as the
  binddn user when binddn/bindpass are configured, rather than as the
  authenticating user as was the case previously.

FEATURES:

- AWS IAM Authentication
- MSSQL Physical Backend
- Lease Listing and Lookup
- TOTP Secret Backend
- Database Secret Backend & Secure Plugins (Beta)

IMPROVEMENTS:

- auth/cert: Support for constraints on subject Common Name and
  DNS/email Subject Alternate Names in certificates
- auth/ldap: Use the binding credentials to search group membership
  rather than the user credentials
- cli/revoke: Add -self option to allow revoking the currently active
  token
- core: Randomize x coordinate in Shamir shares
- tidy: Improvements to auth/token/tidy and sys/leases/tidy to handle
  more cleanup cases
- secret/pki: Add no_store option that allows certificates to be
  issued without being stored. This removes the ability to look up
  and/or add to a CRL but helps with scaling to very large numbers of
  certificates.
- secret/pki: If used with a role parameter, the sign-verbatim/<role>
  endpoint honors the values of generate_lease, no_store, ttl and
  max_ttl from the given role
- secret/pki: Add role parameter allow_glob_domains that enables
  defining names in allowed_domains containing * glob patterns
- secret/pki: Update certificate storage to not use characters that
  are not supported on some filesystems
- storage/etcd3: Add discovery_srv option to query for SRV records to
  find servers
- storage/s3: Support max_parallel option to limit concurrent
  outstanding requests
- storage/s3: Use pooled transport for http client
- storage/swift: Allow domain values for V3 authentication

BUG FIXES:

- api: Respect a configured path in Vault's address
- auth/aws-ec2: New bounds added as criteria to allow role creation
- auth/ldap: Don't lowercase groups attached to users
- cli: Don't panic if vault write is used with the force flag but no
  path
- core: Help operations should request forward since standbys may not
  have appropriate info
- replication: Fix enabling secondaries when certain mounts already
  existed on the primary
- secret/mssql: Update mssql driver to support queries with colons
- secret/pki: Don't lowercase O/OU values in certs
- secret/pki: Don't attempt to validate IP SANs if none are provided