Some packages are repeated for each layer

[nishakm]

When using the dependency list for the package manager, those dependencies may have come in from the previous layer. So some of the packages keep getting listed for each of the layers even though they actually came from a previous layer.

Eg:

FROM vmware/photon:1.0:
	vmware/photon:1.0: 52ef9064d2:
		info: Loading packages from cache for layer 52ef9064d2:
		Package: expat
		Version: 2.2.4-1.ph1
		Project URL: http://expat.sourceforge.net/
		License: MIT
....

	RUN tyum install -y git && tyum clean all -> 832ed18cc3:
	Using invoke listing in command_lib/snippets.yml:
		warning: 
Unrecognized Commands:tyum clean all

	version:
	in container:
	list=`tdnf list installed {package}`
	c=0; for l in $list; do if [ $c == 1 ]; then echo $l; fi; c=$(((c+1)%3)); done;

license:
	in container:
	tdnf info {package} | head -10 | tail -1 | cut -f2 -d":" | xargs

src_url:
	in container:
	tdnf info {package} | head -9 | tail -1 | cut -f2-3 -d":" | xargs

deps:
	in container:
	list=`rpm -qR {package} | cut -f1 -d" "`
	for l in $list; do rpm -qa --queryformat "%{NAME}\n" $l; done;

:
------------------------------------------------

		Package: expat
		Version: 2.2.4-1.ph1
		Project URL: http://expat.sourceforge.net/
		License: MIT

expat is a dependency for git but it has already been satisfied in the previous layer so it wasn't installed with this command.

To get around this, keep track of all the known package names while looking through the layers using a master list.