add Auth backend support for custom path and description (#336)
add Auth backend support for custom path and description (#336)

* Add path support to github auth backend configuration

* Add path support to AWS auth backend configuration

* Add path support to GCP auth backend configuration

* Add path support to LDAP auth backend configuration

* Add path support to approle auth backend configuration

* Fix typo

* Add support for description when mounting new auth backends

banzaicloud/bank-vaults,banzaicloud/bank-vaults