Fix TLS handshake failure during download

[kianmeng]

Use 'ciphersuite_strong' in the TLS manager to resolve handshake failures (DecodeError) due to rejection of weak cipher from remote server when building database through hoogle generate.

Before:

$ hoogle generate Starting generate Downloading https://www.stackage.org/lts/cabal.config... hoogle: Uncaught exception http-client-0.7.19-e53e031a3080635351a782ae473941335ff5cb434b654af0da963246f7167366:Network.HTTP.Client.Types.HttpException:
HttpExceptionRequest Request { host = "www.stackage.org"
port = 443
secure = True
requestHeaders = []
path = "/lts/cabal.config"
queryString = ""
method = "GET"
proxy = Nothing
rawBody = False
redirectCount = 10
responseTimeout = ResponseTimeoutDefault
requestVersion = HTTP/1.1
proxySecureMode = ProxySecureWithConnect
}
(InternalException (HandshakeFailed (Error_Protocol "expecting server hello, got alert : [(AlertLevel_Fatal,DecodeError)]" HandshakeFailure))) While handling HttpExceptionRequest Request {
| host = "www.stackage.org"| port = 443
| secure = True
| requestHeaders = []
| path = "/lts/cabal.config"| queryString = ""| method = "GET"| proxy = Nothing
| rawBody = False
| redirectCount = 10
| responseTimeout = ResponseTimeoutDefault
| requestVersion = HTTP/1.1
| proxySecureMode = ProxySecureWithConnect
| }
| (InternalException (HandshakeFailed (Error_Protocol "expecting server hello, got alert : [(AlertLevel_Fatal,DecodeError)]" HandshakeFailure))) HasCallStack backtrace:
throwIO, called at ./Control/Monad/Trans/Resource.hs:195:13 in resourcet-1.3.0-7299c6173b690f5eb16d3064231923041dd3dc557a27f9dbaf609a7a01dc2448:Control.Monad.Trans.Resource 

After:

$ hoogle -- generate
Starting generate
Downloading https://www.stackage.org/lts/cabal.config... 1.41s
Downloading https://www.stackage.org/nightly/cabal.config... 1.43s
Downloading https://raw.githubusercontent.com/haskell/haskell-platform/master/hptool/src/Releases2015.hs... 1.10s
Downloading https://hackage.haskell.org/packages/index.tar.gz... 5m08s
Downloading https://hackage.haskell.org/packages/hoogle.tar.gz... ...