crypto: Build without using namespace declarations in headers

This is part of a series of commits to clean up using namespace at top
level in headers.

Signed-off-by: Adam C. Emerson <aemerson@redhat.com>

src/crypto/crypto_plugin.h

@@ -22,7 +22,7 @@
 #include "crypto/crypto_accel.h"
 // -----------------------------------------------------------------------------
 
-class CryptoPlugin : public Plugin {
+class CryptoPlugin : public ceph::Plugin {
 
 public:
   CryptoAccelRef cryptoaccel;

src/crypto/isa-l/isal_crypto_plugin.cc

@@ -28,7 +28,7 @@ int __ceph_plugin_init(CephContext *cct,
                        const std::string& type,
                        const std::string& name)
 {
-  PluginRegistry *instance = cct->get_plugin_registry();
+  auto instance = cct->get_plugin_registry();
 
   return instance->add(type, name, new ISALCryptoPlugin(cct));
 }

src/crypto/isa-l/isal_crypto_plugin.h

@@ -31,7 +31,7 @@ public:
   ~ISALCryptoPlugin()
   {}
   virtual int factory(CryptoAccelRef *cs,
-                      ostream *ss)
+                      std::ostream *ss)
   {
     if (cryptoaccel == nullptr)
     {

src/crypto/openssl/openssl_crypto_accel.cc

@@ -23,7 +23,7 @@
 #undef dout_prefix
 #define dout_prefix _prefix(_dout)
 
-static ostream&
+static std::ostream&
 _prefix(std::ostream* _dout)
 {
   return *_dout << "OpensslCryptoAccel: ";

src/crypto/openssl/openssl_crypto_plugin.cc

@@ -26,7 +26,7 @@ int __ceph_plugin_init(CephContext *cct,
                        const std::string& type,
                        const std::string& name)
 {
-  PluginRegistry *instance = cct->get_plugin_registry();
+  auto instance = cct->get_plugin_registry();
 
   return instance->add(type, name, new OpenSSLCryptoPlugin(cct));
 }

src/crypto/openssl/openssl_crypto_plugin.h

@@ -25,7 +25,7 @@ class OpenSSLCryptoPlugin : public CryptoPlugin {
 public:
   explicit OpenSSLCryptoPlugin(CephContext* cct) : CryptoPlugin(cct)
   {}
-  int factory(CryptoAccelRef *cs, ostream *ss) override {
+  int factory(CryptoAccelRef *cs, std::ostream *ss) override {
     if (cryptoaccel == nullptr)
       cryptoaccel = CryptoAccelRef(new OpenSSLCryptoAccel);