Fix plugin documentation

[byumov]

I had a problem with Vault plugin after read documentation from post: https://blog.jetbrains.com/teamcity/2017/09/vault/

Correct format: %vault:secret/some/path!/somekey% From documentation: %vault:secret/some/path!somekey%

Is the post an only one official documentation?

There is a issue, which helped me to solve the problem: https://github.com/JetBrains/teamcity-hashicorp-vault-plugin/issues/1

But, documentation is still incorrect. Fix it, please.

[yoshikakbudto]

with vault 1.1.3

For K/V version 2

For the cli request: vault kv get -field=foo kv/cicd/blue

the correct syntaxes (note /data/):

1. %vault:kv/data/cicd/blue!/foo%
2. %vault:/kv/data/cicd/blue!/foo%

For K/V version 1

For the cli request: ``vault kv get -field=user kv1/creds``` the correct syntaxes is:

1. %vault:kv1/creds!/user%
2. %vault:/kv1/creds!/user%

For the future path problems, to find the correct path

1. enable Vault server audit logs. Forexample vault audit enable file file_path=/vault/logs/audit.log
2. use vault CLI
3. search for the path in audit.log

[VladRassokhin]

Finally fixed plugin description and blog post.