tests: Added test for POP3 DELE command

test800 test801 test802 test803 test804 test805 test806 test807 test808 \

test809 test810 test811 test812 test813 test814 \

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test850 test851 test852 test853 test854 test855 test856 test857 \

test850 test851 test852 test853 test854 test855 test856 test857 test858 \

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test900 test901 test902 test903 test904 test905 test906 test907 test908 \

test909 test910 test911 \

<testcase>

<info>

<keywords>

POP3

DELE

CUSTOMREQUEST

</keywords>

</info>

#

# Server-side

<reply>

</reply>

#

# Client-side

<client>

<server>

pop3

</server>

 <name>

POP3 DELE message

 </name>

 <command>

pop3://%HOSTIP:%POP3PORT/858 -u user:secret -X DELE -I

</command>

</client>

#

# Verify data after the test has been "shot"

<verify>

<protocol>

CAPA

USER user

PASS secret

DELE 858

QUIT

</protocol>

</verify>

</testcase>