email-tests: Renamed the POP3 tests to be in the range 850-857

Started segregating the email protocol tests, into their own protocol
based ranges, in preparation of adding more e-mail related tests to the
test suite.
email-tests: Renamed the SMTP tests to be in the range 900-906

Continued segregating the email protocol tests, into their own protocol
based ranges, in preparation of adding more e-mail related tests to the
test suite.
email-tests: Renamed the IMAP test to be 800

Continued segregating the email protocol tests, into their own protocol
based ranges, in preparation of adding more e-mail related tests to the
test suite.
email-tests: Updated the test data that corresponds to the test number

Finished segregating the email protocol tests, into their own protocol
based ranges, in preparation of adding more e-mail related tests to the
test suite.
Makefile.am: Corrected end of line filler character

The majority of lines, that specify a test file for inclusion, end with
a tab character before the slash whilst some end with a space. Corrected
those that end with a space to end with a tab character as well.