I fixed this now with the Command Line:
sysctl -w vm.min_free_kbytes=0
After that "opkg update" and "opkg install (Package Name)" runs fine! 
Don't forget to reboot after that, the sysctl command is a drastic measure. You want to revert that as soon as you can (easiest way is to reboot).
I see...
Still have Problems to get the OpenVpn-OpenSSL Package installed. Stucks at Download/Install of the required Packages...
Some Packages installed but at the Moment i stuck at:
root@lede:~# opkg install openvpn-openssl
Installing openvpn-openssl (2.4.0-3) to root...
Downloading http://downloads.lede-project.org/releases/17.01.0-rc1/packages/mips_24kc/base/openvpn-openssl_2.4.0-3_mips_24kc.ipk.
Installing libopenssl (1.0.2k-1) to root...
Downloading http://downloads.lede-project.org/releases/17.01.0-rc1/packages/mips_24kc/base/libopenssl_1.0.2k-1_mips_24kc.ipk.
Before i could install some packages also after i reboot some times, but i now it seems to stuck again at the Download because of the Memory Problem...
Help/Alternatives would be great... Can i preload the Packages maybe local for the Installation?
Now the OpenVpn-OpenSSL Package is ready to go.
The Solution was:
http://stackoverflow.com/questions/34112053/openwrt-cant-install-packages-memory-issue
I was also told that LEDE had serious issue with OPKG and RAM management.
I myself just ended up building my own LEDE build with all of the packages I need preinstalled.
The opkg problem remains with 17.01.0 release.
Installing htop (2.0.2-1) to root...
Downloading http://downloads.lede-project.org/releases/17.01.0/packages/mips_24kc/packages/htop_2.0.2-1_mips_24kc.ipk
Collected errors:
- xsystem: wget: vfork: Out of memory.
- opkg_download: Failed to download http://downloads.lede-project.org/releases/17.01.0/packages/mips_24kc/packages/htop_2.0.2-1_mips_24kc.ipk, wget returned -1.
- opkg_install_pkg: Failed to download htop. Perhaps you need to run 'opkg update'?
- opkg_install_cmd: Cannot install package htop.
I solved the problem finally after i comment out two Distribution Feeds (normally not needed) under System -> Software -> Configuration:
Submit the change and if you update the package list now, it should work fine.
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I was told that some improvements where maid to the main branch fixing opkg memory usage. However they didn't made their way into the stable release yet.
Maybe some developer will be able to tell us more about this.