tests from 1.4.3 tag do no work due to changes in test environment (env variables names). Backporting latest testconnections.cpp and mariaadb_nodes.cpp

branch '1.4.4' created in maxscale-system-tests, tests executed:

1.4.3:

92% tests passed, 13 tests failed out of 153
14 - rw_select_insert (Failed)
65 - bug670 (Failed)
91 - fwf2 (Failed)
114 - open_close_connections_ssl (Failed)
129 - mxs37_table_privilege (Failed)
130 - mxs37_table_privilege_galera (Failed)
134 - lots_of_rows (Timeout)
137 - mxs652_bad_ssl (Failed)
145 - rwsplit_readonly (Failed)
147 - mxs621_unreadable_cnf (Failed)
151 - mxs598.py (Failed)
152 - maxinfo.py (Not Run)
153 - simplejavatest (Failed)

1.4.4

Result: 88% tests passed, 18 tests failed out of 153
4 - longblob (Failed)
14 - rw_select_insert (Failed)
28 - bug507 (Failed)
65 - bug670 (Failed)
70 - bug519 (Failed)
72 - mariadb_tests_hartmut.sh (Timeout)
73 - mariadb_tests_hartmut_galera.sh (Timeout)
90 - fwf (Failed)
91 - fwf2 (Failed)
114 - open_close_connections_ssl (Failed)
129 - mxs37_table_privilege (Failed)
130 - mxs37_table_privilege_galera (Failed)
137 - mxs652_bad_ssl (Failed)
145 - rwsplit_readonly (Failed)
147 - mxs621_unreadable_cnf (Failed)
151 - mxs598.py (Failed)
152 - maxinfo.py (Not Run)
153 - simplejavatest (Failed)

CTest arguments: 4,4, ,14,28,65,70,72,73,90,91,114,129,130,137,145,147,151,152,153

MaxScale commit: 749486be398e00e9bc5ce1525a37a56efe7663c1
MaxScale system test commit: 6796843a42f9012815bab69c8bc8800059f05bb8
Job build number: 903
Job name: run_test
Timestamp: 2016-11-01 12-04-17
Test run name: 1.4.4-nov01
Target: 1.4.4-nov01
Box: centos_7_libvirt
Product: mariadb
Version: 10.0

Coredumps: http://max-tst-01.mariadb.com/LOGS/run_test-903/LOGS/binlog_semisync_txs1_ss0/core-maxscale-6-996-994-1657-1478028617
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