incorrect json (minor bugs)

Found a few minor bugs with my JSON flex/bison parser experiment:

fromJSON accepts +100 as a number (ECMA 404 does not) (lib/cc)
DatabaseConnection.toElementDbAccessStringValid has a duplicate host entry (lib/database)
incorrect \n in the pattern of LoggingTest.validPattern (should be \\n) (lib/process)
SharedNetwork4ParserTest::getWorkingConfig duplicates reservation-mode entries in both subnets (lib/dhcpsrv)
SrvConfigTest.unparse has duplicated dhcp4o6-port (twice) and echo-client-id entries (lib/dhcpsrv)
incorrect }, ] sequences (not detected by fromJSON) in D2UpdateMgrTest::makeCannedConfig and d2_cfg_tests.json (bin/d2)
incorrect ], ] sequences (not detected by fromJSON) in StatCmdsTest.statLease[46]GetValid

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