[server][test] Fix a variable name

NumServerInfo ->
NumTestServerInfo
[testFaceRest] Add a test for posting a server
[testFaceRest] Recreate test DB at cut_setup()
[testFaceRest] Fix order of functions
[testFaceRest] Revert 7265e7a

Because the DB name isn't matched with the name used in
setupTestDBServers.
[testFaceRest] Remove needless setupTestDBServers() call

It will be called at startFaceRest()
[testFaceRest] Always recreate config DB
[testFaceRest] Remove needless code
[testDBClientConfig] Rename a function

makeExpectedOutput ->
makeServerOutput
[testDBClientConfig] Use reference instead of pointer
[server][test] Move makeServerOutput from testDBClientConfig.cc to Helper.cc
[testFaceRest] Simplify test_addServer() by using makeServerOutput()
[server][test] Rename a function

makeServerOutput ->
makeServerInfoOutput
[testFaceRest] Test deleting a server
[testDBClientConfig] Test deleting a server
[server][test] Modify setupTestDBConfig() to follow other DB's setup functions
[testDBClientConfig] Setup users table before testing to delete servers
[testDBClientConfig] Fix order of functions
Merge branch 'issue117'

Add missing tests for adding/deleting servers before implementing
editing servers.