[HatohlArmPluginGate] Open pipes to detect the exit of Hatohol Server.
[HatoholArmPluginInterface] Remove an unnecessary line break.
[HatoholArmPluginInterface] Catch exception in the destruction.

onError() may throw an exception. However, if it happens in the
destructor of HatoholArmPluginInterface, it makes the remaing steps
omit. This sometimes causes serious problem.
[HatoholArmPluginTestPairArg] Add a mechanism to pass the paramters to the HapClass's constructors.
[HatoholArmPluginTestPair] Fix typos.

Paramters ->
Parameters
[HatoholArmPluginTestPairArg] Add an option to disable auto-start of the plugin.
[HatoholArmPluginTestPair] Skip to wait for the initiated callback to avoid the block.
[testHapProcessStandardPair] Add a new test: test_hapPipe().
[testHapProcessStandard] Test the passive mode in test_hapPipe().
[testHapProcessStandardPair] Add a new test: test_hapPipeCatchErrorAndExit().
Merge pull request #658 from project-hatohol/prevent-duplicated-same-arm-2

Prevent duplicated same arm 2