Parse ha_storage in config

[akshya96]

#14043
The gh issue is specific to zookeeper but this is applicable for all ha_storage backends
When providing boolean options to an ha_storage backend (ex. tls_enabled, tls_skip_verify) vault cannot parse them. It only accepts string values for boolean fields i.e; "true" and "false"

The parsing works well for storage backends. Therefore, changed the parsing similar to parsing values for storage backend

[ccapurso]

Looks good! A small test to verify the changes address #14043 would be prudent. There are likely already tests for config parsing at this level so we might just need to modify one slightly.