Chunk server: make PSK client authentication default (required) in the case where chunk server authentication with meta server is on.
Kfsio library: fix crypto keys expiration in read method by comparing key creation time with the current time minus key lifetime.
Meta server: fix meta server authentication context authentication "none" type default. By default allow authentication none in the case where both x509 and Kerberos authentication methods are off, do not take into the account PSK authentication.
Client library: replace -.= with _ in the meta server host name / ip when forming client configuration environment variable name to ensure that environment variable name is legal unix shell.variable name in most typical cases.
Qfs test: unset qfs client configuration environment variable names to ensure valid test configuration with no authentication.