Support for login token to avoid login for each command

[Ragsboss]

We are observing that for each EAPI request we make in case of offbox, the remote switch is making one login which results in one authentication request to TACACS, in case that is configured. Please confirm this is the expected behavior currently.

This issue is a request to enhance this, such that EAPI server returns an authentication token that can be reused by clients and thus avoiding doing one login per request..

[dlyssenko]

Hi @Ragsboss, your observation is correct - for every command the login occurs. Currently I'm working on the new release of pyeapi, so trying not to put new code into the branch, however, I'll mark your request as an enhancement and will address in the next release.