DO NOT MERGE Report uncrypt errors in details

Add the error codes for uncrypt and report the failure details in
uncrypt_status.

Test: uncrypt_error logs correctly in last_install
Bug: 31603820
Change-Id: I8e0de845ce1707b6f8f5ae84564c5e93fd5f5ef5
(cherry picked from commit da44cf18f3)

install.cpp

@@ -532,7 +532,7 @@ install_package(const char* path, bool* wipe_cache, const char* install_file,
         std::string uncrypt_status;
         if (!android::base::ReadFileToString(UNCRYPT_STATUS, &uncrypt_status)) {
             LOGW("failed to read uncrypt status: %s\n", strerror(errno));
-        } else if (!android::base::StartsWith(uncrypt_status, "uncrypt_time:")) {
+        } else if (!android::base::StartsWith(uncrypt_status, "uncrypt_")) {
             LOGW("corrupted uncrypt_status: %s: %s\n", uncrypt_status.c_str(), strerror(errno));
         } else {
             log_buffer.push_back(android::base::Trim(uncrypt_status));