tests/dummyssh

check-code: fix issues with finding patterns in unified tests, fix tests

- old-style patterns without ^ were getting improperly anchored
- finditer was matching against beginning of line poorly
- \s was matching newlines
- [^x] was matching newlines

so we:

- remove earlier hacks for multiline matching
- fix unified test anchoring by adding .*
- replace \s with [ \t]
- replace [^x] with [^\nx]
- force all matches into multiline mode so ^ anchors work

This uncovers a number of test issues that are then repaired.

#!/usr/bin/env python

import sys
import os

os.chdir(os.getenv('TESTTMP'))

if sys.argv[1] != "user@dummy":
    sys.exit(-1)

os.environ["SSH_CLIENT"] = "127.0.0.1 1 2"

log = open("dummylog", "ab")
log.write("Got arguments")
for i, arg in enumerate(sys.argv[1:]):
    log.write(" %d:%s" % (i+1, arg))
log.write("\n")
log.close()
r = os.system(sys.argv[2])
sys.exit(bool(r))