Specify widevine/media_cas_packager_sdk/presubmit in media_cas_packager_sdk METADATA file.

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Moves ecm_generator to media_cas_packager_sdk/internal.

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Add a simple TCP server listening on a port. My intention is to use this server to support the Simulcrypt APIs (TODO).

Also add a simple TCP client binary for testing the server and also demo how to call the Simulcrypt APIs (TODO).

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If only a single key is in the ECM, it is the EVEN key. To make the code matches this understanding, change a parameter from 'false' to 'true'. But this change has NO impact on the produced ECM, regardless this parameter is 'false' or 'true' (i.e., whether using push_front or push_back), only a single key is in the ECM.

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Add classes that process Simulcrypt ECMG messages
1) Stream_set-up
2) CW_provision

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Renames server and client binaries.

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Make ecmg call ecm_generator to generate ecm. The return of the ecm to Simulcrypt caller will be implemented in the next CL.

For now, using the 'key' (control word) in CW_provision message also as the 'key_id'.

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Move common folder

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=217358698

common/openssl_util.h

@@ -9,8 +9,8 @@
 // RAII wrapper classes for cleaning up various OpenSSL dynamically allocated
 // structures.
 
-#ifndef COMMON_OPENSSL_UTIL_H__
-#define COMMON_OPENSSL_UTIL_H__
+#ifndef COMMON_OPENSSL_UTIL_H_
+#define COMMON_OPENSSL_UTIL_H_
 
 #include "openssl/bio.h"
 #include "openssl/evp.h"
@@ -74,4 +74,4 @@ using ScopedX509InfoStack =
     ScopedOpenSSLStack<STACK_OF(X509_INFO), X509_INFO, X509_INFO_free>;
 using ScopedX509InfoStackOnly = ScopedOpenSSLStackOnly<STACK_OF(X509_INFO)>;
 
-#endif  // COMMON_OPENSSL_UTIL_H__
+#endif  // COMMON_OPENSSL_UTIL_H_