tests: Added IMAP login authentication with initial response test

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<testcase>

<info>

<keywords>

IMAP

IMAP AUTH LOGIN SASL-IR

</keywords>

</info>

#

# Server-side

<reply>

<servercmd>

AUTH LOGIN

CAPA SASL-IR

REPLY AUTHENTICATE + UGFzc3dvcmQ6

REPLY c2VjcmV0 A002 OK AUTHENTICATE completed

</servercmd>

<data>

From: me@somewhere

To: fake@nowhere

body

--

  yours sincerely

</data>

</reply>

#

# Client-side

<client>

<server>

imap

</server>

 <name>

IMAP login authentication with initial response

 </name>

 <command>

'imap://%HOSTIP:%IMAPPORT/826/;UID=1' -u user:secret

</command>

</client>

#

# Verify data after the test has been "shot"

<verify>

<protocol>

A001 CAPABILITY

A002 AUTHENTICATE LOGIN dXNlcg==

c2VjcmV0

A003 SELECT 826

A004 FETCH 1 BODY[]

A005 LOGOUT

</protocol>

</verify>

</testcase>