[server][HatoholArmPluginGate] Add a basic code for using a AMQP system.
[TravisCI] Install a library for QPid (AMQP implementation).
[server][DBClientConfig] Add a new table arm_plugins

getArmPluginInfo() uses std::vector for returning data,
althogh other similar methods use std::list.
Hereafter I prefer vector than list, because
it is considered that the performance is better
(see also GitHub's issue #178).
[server][DBClientConfig] Add a check if there's the same arm plugin name.
[server][DBClientConfig] Fix a wrapping style according to the coding convention.
[server][DBClientConfing] Add a new test: test_saveArmPluginInfoWithNoName().
[server][DBClientConfing] Add a new test: test_saveArmPluginInfoWithNoPath().
[server][DBClientConfing] Add a new test: test_saveArmPluginInfoWithInvalidType().
[server][DBClientConfing] Add a function to update a record.
[TravisCI] Set the logger level to WARN to suppress the number of log lines.

TravisCI shows the standard output until 10,000 lines.
However, output of our test exceeds it. As a result,
we cannot see entire logs.
[TravisCI] Suppress the number of lines of test output.
[Autoconf] Use AC_CHECK_LIBS to check existence of libqpidmessaging.

The macro automatically adds -l<library> to the linker option.
So I removed the explicit QPID_LIBS definition.
[TravisCI] Suppress the number of lines of test output.
Merge pull request #182 from project-hatohol/issue-171

Issue 171