Clear the environment before setting container environment.

This ensures that there are no erroneous env variables left over by
any subsystem before the container and process specific env
variables are applied.

Signed-off-by: Archana Shinde <archana.m.shinde@intel.com>

Author: amshinde

src/exec.c

@@ -510,6 +510,9 @@ static int hyper_do_exec_cmd(struct hyper_exec *exec, int pipe, struct stdio_con
 		goto out;
 	}
 
+	// Make sure we start with a clean environment
+	clearenv();
+
 	// set early env. the container env config can overwrite it
 	setenv("HOME", "/root", 1);
 	setenv("HOSTNAME", exec->pod->hostname, 1);